中关村在线

网站导航

产品排行产品入库广告联盟手机客户端

H3C S6520-42QF-EI

H3C S6520-42QF-EI

官方图

共1张图片>>

参考报价：

￥23000

发布采购需求

查看详细报价>

商家报价：: ¥22080 （共70家经销商）

￥23?00打开APP，去京东下单最高减500元

打开APP下单最高立减500

产品类型：万兆以太网交换机，企业级交换机

应用层级：三层

背板带宽： 1280Gbps/12.8Tbps

更多参数>

获取底价我要点评加入对比

2024-11-25 行情华三H3C S5120V3-28P-LI网管交换机促销
2024-11-25 行情 H3C S5560X-30C-EI核心交换机5600元
2024-11-25 行情 H3C S7503X-G机箱式核心交换机促销
2024-11-25 行情华三S7006X机箱式交换机促销价23000+

配置参数

详细参数

产品类型	万兆以太网交换机，企业级交换机
应用层级	三层
传输速率	1000/10000Mbps
交换方式	存储-转发
背板带宽	1280Gbps/12.8Tbps
包转发率	720Mpps
MAC地址表	支持静态MAC地址，支持黑洞MAC地址，支持设置端口MAC地址学习最大个数
端口结构	非模块化

端口数量	42个
端口描述	40个1/10G SFP Plus端口，2个QSFP口
控制端口	1个console
VLAN	支持基于端口的VLAN（4094个）
QOS	支持对端口接收报文的速率和发送报文的速率进行限制
组播管理	支持IGMP Snooping v2/v3
网络管理	支持命令行接口（CLI）配置
安全管理	支持用户分级管理和口令保护

查看完整参数>>

产品图片

查看更多图赏>

更多竞品对比>

产品比一比

H3C S6520-42QF-EI

￥23000

11票支持支持

具体详情

CISCO N9K-C93180YC-EX

￥40000

15票支持支持

可以选择产品进行切换哦~

换一批

CISCO N9K-C93180YC-EX

￥40000

正在进行PK

对比>>
华为S6720-30C-EI-24S-AC

￥25000

正在进行PK

对比>>
华为S6720-54C-EI-48S-AC

￥31750

正在进行PK

对比>>
华为S6720S-26Q-LI-24S-AC

￥8030

正在进行PK

对比>>
华为S6720S-32X-LI-32S-AC

￥8250

正在进行PK

对比>>

与其他产品进行PK：

华为

请选择产品

添加PK

购机必读

H3C S7003X机箱式核心交换机含税14230: H3C S5130S-28P-EI网管交换机1200元可靠华三LS-5130S-28P-HPWR-EI-AC交换机西安热卖

品质出众华三S5560X-34C-HI交换机西安报价: 高效稳定H3C LS-5570S-36F-EI交换机西安热卖 CISCO C9300X-48TX-A北京促销热卖

大家一起说

常见问题：

我要提问专家速答

Q
s9500前面的小灯是干什么用的，怎么关闭。我给刚满月的小孩拍照片，不想让灯闪。

A
闪光灯可以在拍摄界面设置中关闭的，如果是发红光的那是测距用的，关不掉的。
Q
H3C交换机怎样绑定MAC地址,命令是哪些?

A
PC1====(E1/0/1)SW1[H3C]amuser-bindmac-addr000f-e20...[详细]

Q
H3C路由器、交换机配置

A
昏死你,这个也太...我打给你看,VLAN的就不说了DHCPipdhcppool1(你的IP段地址池...[详细]
Q
西门子wm12s3600w可以自己设置公斤数么，说明书丢了，谁有说明书！！！

A
西门子洗衣机XQG80-12S360(WM12S3600W)点击下载：（下载安装PDF阅读器打开浏览...[详细]

查看更多问答>>

大家来点评

0条口碑评论我要点评

猜你喜欢

更多>

热门推荐

关于H3C

H3C

联系电话：800-810-0504 400-810-0504
官方网站：点此进入
电子邮件：customer_service@h3c.com
联系地址：杭州市高新技术产业开发区之江科技工业园六和路310号 H3C公司

用户还关注

1
CISCO C9300L -24T-4G-E
对比
￥23000
2
华为S7703
对比
￥13000
3
华为S7706
对比
￥13000
4
H3C S6520X-30QC-EI
对比
￥17380
5
H3C S7003X
对比
￥20329

<li class="current">
        <span class="num n1">1</span>
        <a class="pic" href="/switches/index1230690.shtml">
            <img width="100" height="75" src="https://2d.zol-img.com.cn/product_small/13_80x60/115/ceLazWqyeyU.jpg" alt="H3C S6520X-30QC-EI">
        </a>
        <div class="name">
            <a href="/switches/index1230690.shtml">H3C S6520X-30QC-EI</a>
        </div>
        <span class="compare-btn" data-comparebtn-id="1230690" node-type="interest-compare"
            data-compare="1230690,H3C S6520X-30QC-EI,/switches/index1230690.shtml,https://2d.zol-img.com.cn/product_small/13_80x60/115/ceLazWqyeyU.jpg,46"><i></i>对比</span>
        <div class="price">￥17380</div>
    </li>
            
    <li>
        <span class="num n2">2</span>
        <a class="pic" href="/switches/index1402601.shtml">
            <img width="100" height="75" src="https://i2-prosmall-fd.zol-img.com.cn/t_s80x60/g7/M00/08/00/ChMkLGT1jrGIQW3AAAAFW3vavusAAUeowCCA0cAAAVz222.jpg" alt="H3C LS-5130S-28P-EI-H1">
        </a>
        <div class="name">
            <a href="/switches/index1402601.shtml">H3C LS-5130S-28P-EI-H1</a>
        </div>
        <span class="compare-btn" data-comparebtn-id="1402601" node-type="interest-compare"
            data-compare="1402601,H3C LS-5130S-28P-EI-H1,/switches/index1402601.shtml,https://i2-prosmall-fd.zol-img.com.cn/t_s80x60/g7/M00/08/00/ChMkLGT1jrGIQW3AAAAFW3vavusAAUeowCCA0cAAAVz222.jpg,46"><i></i>对比</span>
        <div class="price">￥2300</div>
    </li>
            
    <li>
        <span class="num n3">3</span>
        <a class="pic" href="/switches/index1384663.shtml">
            <img width="100" height="75" src="https://i2-prosmall-fd.zol-img.com.cn/t_s80x60/g6/M00/01/07/ChMkKWEl_cOINjS_AAB33zTkAYgAATGjAJFK_gAAHf3832.jpg" alt="H3C S5024PV5-EI">
        </a>
        <div class="name">
            <a href="/switches/index1384663.shtml">H3C S5024PV5-EI</a>
        </div>
        <span class="compare-btn" data-comparebtn-id="1384663" node-type="interest-compare"
            data-compare="1384663,H3C S5024PV5-EI,/switches/index1384663.shtml,https://i2-prosmall-fd.zol-img.com.cn/t_s80x60/g6/M00/01/07/ChMkKWEl_cOINjS_AAB33zTkAYgAATGjAJFK_gAAHf3832.jpg,46"><i></i>对比</span>
        <div class="price">￥1499</div>
    </li>
            
    <li>
        <span class="num">4</span>
        <a class="pic" href="/switches/index1229203.shtml">
            <img width="100" height="75" src="https://2a.zol-img.com.cn/product_small/13_80x60/408/ceUVn6XMDFoM.jpg" alt="H3C S5130S-52P-EI">
        </a>
        <div class="name">
            <a href="/switches/index1229203.shtml">H3C S5130S-52P-EI</a>
        </div>
        <span class="compare-btn" data-comparebtn-id="1229203" node-type="interest-compare"
            data-compare="1229203,H3C S5130S-52P-EI,/switches/index1229203.shtml,https://2a.zol-img.com.cn/product_small/13_80x60/408/ceUVn6XMDFoM.jpg,46"><i></i>对比</span>
        <div class="price">￥3899</div>
    </li>
            
    <li>
        <span class="num">5</span>
        <a class="pic" href="/switches/index1397484.shtml">
            <img width="100" height="75" src="https://i0-prosmall-fd.zol-img.com.cn/t_s80x60/g7/M00/00/08/ChMkLGHvZamIYwKgAADSVRI7bwsAAACBAFLFoUAANJt970.jpg" alt="H3C S7003X">
        </a>
        <div class="name">
            <a href="/switches/index1397484.shtml">H3C S7003X</a>
        </div>
        <span class="compare-btn" data-comparebtn-id="1397484" node-type="interest-compare"
            data-compare="1397484,H3C S7003X,/switches/index1397484.shtml,https://i0-prosmall-fd.zol-img.com.cn/t_s80x60/g7/M00/00/08/ChMkLGHvZamIYwKgAADSVRI7bwsAAACBAFLFoUAANJt970.jpg,46"><i></i>对比</span>
        <div class="price">￥20329</div>
    </li>

热门对比产品推荐

1
CISCO N9K-C93180YC-EX
对比
￥40000
2
华为S6720-30C-EI-24S-AC
对比
￥25000
3
华为S6720-54C-EI-48S-AC
对比
￥31750
4
华为S6720S-26Q-LI-24S-AC
对比
￥8030
5
华为S6720S-32X-LI-32S-AC
对比
￥8250
6
H3C S6520-24S-SI
对比
￥9000
7
华为S6720S-26Q-SI-24S-AC
对比
￥9999
8
CISCO N9K-C92160YC-X
对比
￥38000
9
CISCO WS-C3850-24XS-S
对比
￥38000
10
华为S6720-32X-SI-32S-AC
对比
￥22222

关注该品牌的还关注

换一换

￥17380
H3C S6520X-30QC-EI

同品牌，同应用层级
对比
￥2300
H3C LS-5130S-28P-EI-H1

同品牌，同应用层级
对比
￥1499
H3C S5024PV5-EI

同品牌，同应用层级

好评率97%
对比
￥3899
H3C S5130S-52P-EI

同品牌，同端口结构

好评率100%
对比
￥20329
H3C S7003X

同品牌，同端口结构

好评率100%
对比
￥7960
H3C S5570S-36F-EI

同品牌，同交换方式
对比
￥16492
H3C S5560X-30F-EI

同品牌，同应用层级

好评率100%
对比
￥17014
H3C S7503E-M

同品牌，同应用层级

好评率100%
对比
￥1699
H3C S5008PV5-EI-HPWR

同品牌，同端口结构

好评率100%
对比
￥3799
H3C LS-5130S-28S-EI-H1

同品牌，同端口结构
对比
￥9000
H3C S6520-24S-SI

同品牌，同产品类型
对比
￥3640
H3C S5130S-28P-EI

同品牌，同MAC地址表

好评率100%
对比

大家都买什么

口碑排行

<li class="current">
                <span class="num n1">1</span>
                                <a class="pic" href="/switches/index1438426.shtml">
                    <img width="100" height="75" src="https://i1-prosmall-fd.zol-img.com.cn/t_s80x60/g7/M00/08/08/ChMkLGSsufGIbN9MAAAGCAk8rjAAASgvADx-0sAAAYg181.jpg" alt="">
                </a>
                <div class="name"><a href="/switches/index1438426.shtml">华为S5735S-L24T4S-QA2</a></div>
                <div class="price">￥1999</div>
            </li>
                        <li>
                <span class="num n2">2</span>
                                <a class="pic" href="/switches/index1230690.shtml">
                    <img width="100" height="75" src="https://2d.zol-img.com.cn/product_small/13_100x75/115/ceLazWqyeyU.jpg" alt="">
                </a>
                <div class="name"><a href="/switches/index1230690.shtml">H3C S6520X-30QC-EI</a></div>
                <div class="price">￥17380</div>
            </li>
                        <li>
                <span class="num n3">3</span>
                                <a class="pic" href="/switches/index1376250.shtml">
                    <img width="100" height="75" src="https://2f.zol-img.com.cn/product_small/14_100x75/979/ceUP03W7yP2E.jpg" alt="">
                </a>
                <div class="name"><a href="/switches/index1376250.shtml">锐捷网络RG-NBS3100-24GT4SFP</a></div>
                <div class="price">￥2300</div>
            </li>
                        <li>
                <span class="num">4</span>
                                <a class="pic" href="/switches/index1436708.shtml">
                    <img width="100" height="75" src="https://i1-prosmall-fd.zol-img.com.cn/t_s80x60/g7/M00/0A/0D/ChMkLGOZKimIUWZIAAAHgKUeW9UAAKqpQHfiyAAAAeY247.jpg" alt="">
                </a>
                <div class="name"><a href="/switches/index1436708.shtml">CISCO C9300L -24T-4G-E</a></div>
                <div class="price">￥23000</div>
            </li>
                        <li>
                <span class="num">5</span>
                                <a class="pic" href="/switches/index1380346.shtml">
                    <img width="100" height="75" src="https://i4-prosmall-fd.zol-img.com.cn/t_s80x60/g7/M00/04/08/ChMkLGLPecWIAWOOAAAKUEkjc34AAFRvQHVeHgAAApo424.jpg" alt="">
                </a>
                <div class="name"><a href="/switches/index1380346.shtml">华为S5735-L24T4S-A1</a></div>
                <div class="price">￥3299</div>
            </li>
                        <li>
                <span class="num">6</span>
                                <a class="pic" href="/switches/index291476.shtml">
                    <img width="100" height="75" src="https://i1-prosmall-fd.zol-img.com.cn/t_s80x60/g7/M00/0E/08/ChMkK2dABWaIHjodAAAMzYk9pmwAAl6RwHJ624AAAzl257.jpg" alt="">
                </a>
                <div class="name"><a href="/switches/index291476.shtml">华为S7703</a></div>
                <div class="price">￥13000</div>
            </li>
                        <li>
                <span class="num">7</span>
                                <a class="pic" href="/switches/index329758.shtml">
                    <img width="100" height="75" src="https://i1-prosmall-fd.zol-img.com.cn/t_s80x60/g7/M00/0E/08/ChMkLGdABWmIIn8tAAATYdJHHp0AAl6RwHq0EUAABN5851.jpg" alt="">
                </a>
                <div class="name"><a href="/switches/index329758.shtml">华为S7706</a></div>
                <div class="price">￥13000</div>
            </li>
                        <li>
                <span class="num">8</span>
                                <a class="pic" href="/switches/index1392542.shtml">
                    <img width="100" height="75" src="https://i3-prosmall-fd.zol-img.com.cn/t_s80x60/g6/M00/0C/09/ChMkKWFxBvmIMkZaAACl2iYQ2AAAAUzAwHzobwAAKXy349.jpg" alt="">
                </a>
                <div class="name"><a href="/switches/index1392542.shtml">华为S5735S-L24T4S-A1</a></div>
                <div class="price">￥2080</div>
            </li>
                        <li>
                <span class="num">9</span>
                                <a class="pic" href="/switches/index1827581.shtml">
                    <img width="100" height="75" src="https://i2-prosmall-fd.zol-img.com.cn/t_s80x60/g7/M00/0D/08/ChMkK2ad0DaIPiQ2AAAGytZHLnoAAg2xgA-OGgAAAbi138.jpg" alt="">
                </a>
                <div class="name"><a href="/switches/index1827581.shtml">华为CloudEngine S5735-L24T4XE-A-V2</a></div>
                <div class="price">暂无报价</div>
            </li>
                        <li>
                <span class="num">10</span>
                                <a class="pic" href="/switches/index1392497.shtml">
                    <img width="100" height="75" src="https://i2-prosmall-fd.zol-img.com.cn/t_s80x60/g6/M00/0C/08/ChMkKmFw4tKITzzbAABciRc19iMAAUywACvF_4AAFyh172.jpg" alt="">
                </a>
                <div class="name"><a href="/switches/index1392497.shtml">华为S5735S-L48T4S-A1</a></div>
                <div class="price">￥3599</div>
            </li>

大家都在看

<li class="current">
            <span class="num n1">1</span>
            <a class="pic" href="/switches/index2109912.shtml"><img alt="H3C S5590-48TS4X2QC-EI" width="100" height="75" src="https://2e.zol-img.com.cn/product/269_100x75/450/ce6lckMi43A4U.jpg"></a>
            <div class="name"><a title="H3C S5590-48TS4X2QC-EI" href="/switches/index2109912.shtml">H3C S5590-48TS4X2QC-EI</a></div>
            <span class="compare-btn" data-comparebtn-id="2109912" node-type="interest-compare" data-compare="2109912,H3C S5590-48TS4X2QC-EI,/switches/index2109912.shtml,https://2e.zol-img.com.cn/product/269_80x60/450/ce6lckMi43A4U.jpg,46"><i></i>对比</span>
            <a href="https://union-click.jd.com/sem.php?unionId=281&siteid=20170818001&to=https://item.jd.com/100115357431.html" target="_blank" rel="nofollow" data-eventcount="detail_zs_alllook_new_jd"><div class="price jd">￥48000</div></a>
        </li>
                <li>
            <span class="num n2">2</span>
            <a class="pic" href="/switches/index2109911.shtml"><img alt="H3C S5590-24X4YC-EI" width="100" height="75" src="https://2e.zol-img.com.cn/product/269_100x75/450/ce6lckMi43A4U.jpg"></a>
            <div class="name"><a title="H3C S5590-24X4YC-EI" href="/switches/index2109911.shtml">H3C S5590-24X4YC-EI</a></div>
            <span class="compare-btn" data-comparebtn-id="2109911" node-type="interest-compare" data-compare="2109911,H3C S5590-24X4YC-EI,/switches/index2109911.shtml,https://2e.zol-img.com.cn/product/269_80x60/450/ce6lckMi43A4U.jpg,46"><i></i>对比</span>
            <a href="https://union-click.jd.com/sem.php?unionId=281&siteid=20170818001&to=https://item.jd.com/100115357397.html" target="_blank" rel="nofollow" data-eventcount="detail_zs_alllook_new_jd"><div class="price jd">￥45000</div></a>
        </li>
                <li>
            <span class="num n3">3</span>
            <a class="pic" href="/switches/index2109910.shtml"><img alt="H3C S5590-48UXM4YC-EI" width="100" height="75" src="https://2b.zol-img.com.cn/product/269_100x75/465/ceeaIHU3hDEhA.jpg"></a>
            <div class="name"><a title="H3C S5590-48UXM4YC-EI" href="/switches/index2109910.shtml">H3C S5590-48UXM4YC-EI</a></div>
            <span class="compare-btn" data-comparebtn-id="2109910" node-type="interest-compare" data-compare="2109910,H3C S5590-48UXM4YC-EI,/switches/index2109910.shtml,https://2b.zol-img.com.cn/product/269_80x60/465/ceeaIHU3hDEhA.jpg,46"><i></i>对比</span>
            <a href="https://union-click.jd.com/sem.php?unionId=281&siteid=20170818001&to=https://item.jd.com/100115357399.html" target="_blank" rel="nofollow" data-eventcount="detail_zs_alllook_new_jd"><div class="price jd">￥62000</div></a>
        </li>
                <li>
            <span class="num">4</span>
            <a class="pic" href="/switches/index2109909.shtml"><img alt="H3C S5590-24UXM4YC-EI" width="100" height="75" src="https://2f.zol-img.com.cn/product/269_100x75/469/ceZFWjsaDmo.jpg"></a>
            <div class="name"><a title="H3C S5590-24UXM4YC-EI" href="/switches/index2109909.shtml">H3C S5590-24UXM4YC-EI</a></div>
            <span class="compare-btn" data-comparebtn-id="2109909" node-type="interest-compare" data-compare="2109909,H3C S5590-24UXM4YC-EI,/switches/index2109909.shtml,https://2f.zol-img.com.cn/product/269_80x60/469/ceZFWjsaDmo.jpg,46"><i></i>对比</span>
            <a href="/switches/index2109909.shtml" target="_blank"><div class="price">￥47000</div></a>
        </li>
                <li>
            <span class="num">5</span>
            <a class="pic" href="/switches/index2109908.shtml"><img alt="H3C S5590-48P6XC-EI" width="100" height="75" src="https://2e.zol-img.com.cn/product/269_100x75/474/ce7DRG7dcqdQ.jpg"></a>
            <div class="name"><a title="H3C S5590-48P6XC-EI" href="/switches/index2109908.shtml">H3C S5590-48P6XC-EI</a></div>
            <span class="compare-btn" data-comparebtn-id="2109908" node-type="interest-compare" data-compare="2109908,H3C S5590-48P6XC-EI,/switches/index2109908.shtml,https://2e.zol-img.com.cn/product/269_80x60/474/ce7DRG7dcqdQ.jpg,46"><i></i>对比</span>
            <a href="/switches/index2109908.shtml" target="_blank"><div class="price">￥18850</div></a>
        </li>
                <li>
            <span class="num">6</span>
            <a class="pic" href="/switches/index2109907.shtml"><img alt="H3C S5590-28P8XC-EI" width="100" height="75" src="https://2e.zol-img.com.cn/product/269_100x75/456/ce6SokAYDcAgw.jpg"></a>
            <div class="name"><a title="H3C S5590-28P8XC-EI" href="/switches/index2109907.shtml">H3C S5590-28P8XC-EI</a></div>
            <span class="compare-btn" data-comparebtn-id="2109907" node-type="interest-compare" data-compare="2109907,H3C S5590-28P8XC-EI,/switches/index2109907.shtml,https://2e.zol-img.com.cn/product/269_80x60/456/ce6SokAYDcAgw.jpg,46"><i></i>对比</span>
            <a href="/switches/index2109907.shtml" target="_blank"><div class="price">￥21999</div></a>
        </li>
                <li>
            <span class="num">7</span>
            <a class="pic" href="/switches/index2109906.shtml"><img alt="H3C S5590-48S4XC-EI" width="100" height="75" src="https://2a.zol-img.com.cn/product/269_100x75/458/ce1tDQuVqGCPk.jpg"></a>
            <div class="name"><a title="H3C S5590-48S4XC-EI" href="/switches/index2109906.shtml">H3C S5590-48S4XC-EI</a></div>
            <span class="compare-btn" data-comparebtn-id="2109906" node-type="interest-compare" data-compare="2109906,H3C S5590-48S4XC-EI,/switches/index2109906.shtml,https://2a.zol-img.com.cn/product/269_80x60/458/ce1tDQuVqGCPk.jpg,46"><i></i>对比</span>
            <a href="/switches/index2109906.shtml" target="_blank"><div class="price">￥29550</div></a>
        </li>
                <li>
            <span class="num">8</span>
            <a class="pic" href="/switches/index2109905.shtml"><img alt="H3C S5590-28S8XC-EI" width="100" height="75" src="https://2a.zol-img.com.cn/product/269_100x75/470/ceHyTBadSpvmo.jpg"></a>
            <div class="name"><a title="H3C S5590-28S8XC-EI" href="/switches/index2109905.shtml">H3C S5590-28S8XC-EI</a></div>
            <span class="compare-btn" data-comparebtn-id="2109905" node-type="interest-compare" data-compare="2109905,H3C S5590-28S8XC-EI,/switches/index2109905.shtml,https://2a.zol-img.com.cn/product/269_80x60/470/ceHyTBadSpvmo.jpg,46"><i></i>对比</span>
            <a href="/switches/index2109905.shtml" target="_blank"><div class="price">￥18900</div></a>
        </li>
                <li>
            <span class="num">9</span>
            <a class="pic" href="/switches/index2109904.shtml"><img alt="H3C S5590-48T4XC-EI" width="100" height="75" src="https://2f.zol-img.com.cn/product/269_100x75/451/ce6Td2Ud5Eeg.jpg"></a>
            <div class="name"><a title="H3C S5590-48T4XC-EI" href="/switches/index2109904.shtml">H3C S5590-48T4XC-EI</a></div>
            <span class="compare-btn" data-comparebtn-id="2109904" node-type="interest-compare" data-compare="2109904,H3C S5590-48T4XC-EI,/switches/index2109904.shtml,https://2f.zol-img.com.cn/product/269_80x60/451/ce6Td2Ud5Eeg.jpg,46"><i></i>对比</span>
            <a href="/switches/index2109904.shtml" target="_blank"><div class="price">￥22680</div></a>
        </li>
                <li>
            <span class="num">10</span>
            <a class="pic" href="/switches/index2109903.shtml"><img alt="H3C S5590-28T8XC-EI" width="100" height="75" src="https://2e.zol-img.com.cn/product/269_100x75/450/ce6lckMi43A4U.jpg"></a>
            <div class="name"><a title="H3C S5590-28T8XC-EI" href="/switches/index2109903.shtml">H3C S5590-28T8XC-EI</a></div>
            <span class="compare-btn" data-comparebtn-id="2109903" node-type="interest-compare" data-compare="2109903,H3C S5590-28T8XC-EI,/switches/index2109903.shtml,https://2e.zol-img.com.cn/product/269_80x60/450/ce6lckMi43A4U.jpg,46"><i></i>对比</span>
            <a href="/switches/index2109903.shtml" target="_blank"><div class="price">￥18950</div></a>
        </li>

PK一下就知道

热门标签

按产品换一换