检测节点
| 区域/运营商 | 响应最快 | 响应最慢 | 平均响应 |
|---|---|---|---|
| 全部 | 广东广州移动0.407s | 天津电信1.434s | 0.843s |
| 电信 | 辽宁盘锦电信0.447s | 天津电信1.434s | 0.763s |
| 移动 | 广东广州移动0.407s | 江苏无锡移动1.294s | 0.881s |
| 联通 | 广东深圳联通0.619s | 甘肃庆阳联通1.039s | 0.848s |
| 华东 | 山东青岛移动0.812s | 江苏无锡移动1.294s | 0.999s |
| 华北 | 内蒙古包头移动0.706s | 天津电信1.434s | 0.919s |
| 华南 | 广东广州移动0.407s | 广西梧州联通1.002s | 0.63s |
| 华中 | 湖北宜昌联通0.69s | 河南驻马店电信0.808s | 0.741s |
| 西北 | 青海西宁电信0.581s | 甘肃庆阳移动1.115s | 0.926s |
| 西南 | 西藏拉萨移动1.058s | 西藏拉萨移动1.058s | 1.058s |
| 东北 | 辽宁盘锦电信0.447s | 辽宁盘锦联通0.829s | 0.648s |
|
检测点
运营商
检测节点
|
解析IP |
状态 |
总时间 |
解析时间 |
连接时间 |
操作 |
|---|---|---|---|---|---|---|
|
电信
北京
|
8.217.127.189 (香港香港阿里云) | 200 | 0.813s | 0.151s | 0.046s |
下载时间:0.139s 下载大小:7.33KB 下载速度:52.734KB/s HEAD:
HTTP/1.1 301 Moved Permanently Server: nginx/1.24.0 (Ubuntu) Date: Tue, 10 Nov 2026 16:28:46 GMT Content-Type: text/html Content-Length: 178 Connection: keep-alive Location: https://www.llins-tech.com/ HTTP/1.1 200 OK Server: nginx/1.24.0 (Ubuntu) Date: Tue, 10 Nov 2026 16:28:46 GMT Content-Type: text/html; charset=utf-8 Last-Modified: Thu, 23 Jul 2026 08:07:21 GMT Transfer-Encoding: chunked Connection: keep-alive ETag: W/"6a61cbb9-6225" X-Content-Type-Options: nosniff X-Frame-Options: SAMEORIGIN Referrer-Policy: strict-origin-when-cross-origin Cache-Control: no-cache, no-store, must-revalidate Content-Encoding: gzip |
|
电信
广西北海
|
8.217.127.189 (香港香港阿里云) | 200 | 0.493s | 0.259s | 0.074s |
下载时间:0s 下载大小:7.33KB 下载速度:0KB/s HEAD:
HTTP/2.0 200 OK Cache-Control: no-cache, no-store, must-revalidate Content-Encoding: gzip Content-Type: text/html; charset=utf-8 Date: Tue, 10 Nov 2026 16:28:46 GMT Etag: W/"6a61cbb9-6225" Last-Modified: Thu, 23 Jul 2026 08:07:21 GMT Referrer-Policy: strict-origin-when-cross-origin Server: nginx/1.24.0 (Ubuntu) X-Content-Type-Options: nosniff X-Frame-Options: SAMEORIGIN |
|
电信
河南驻马店
|
8.217.127.189 (香港香港阿里云) | 200 | 0.808s | 0.536s | 0.083s |
下载时间:0.001s 下载大小:7.33KB 下载速度:7330KB/s HEAD:
HTTP/2.0 200 OK Cache-Control: no-cache, no-store, must-revalidate Content-Encoding: gzip Content-Type: text/html; charset=utf-8 Date: Tue, 10 Nov 2026 16:28:46 GMT Etag: W/"6a61cbb9-6225" Last-Modified: Thu, 23 Jul 2026 08:07:21 GMT Referrer-Policy: strict-origin-when-cross-origin Server: nginx/1.24.0 (Ubuntu) X-Content-Type-Options: nosniff X-Frame-Options: SAMEORIGIN |
|
电信
辽宁盘锦
|
8.217.127.189 (香港香港阿里云) | 200 | 0.447s | 0.28s | 0.053s |
下载时间:0s 下载大小:7.33KB 下载速度:0KB/s HEAD:
HTTP/2.0 200 OK Cache-Control: no-cache, no-store, must-revalidate Content-Encoding: gzip Content-Type: text/html; charset=utf-8 Date: Tue, 10 Nov 2026 16:28:46 GMT Etag: W/"6a61cbb9-6225" Last-Modified: Thu, 23 Jul 2026 08:07:21 GMT Referrer-Policy: strict-origin-when-cross-origin Server: nginx/1.24.0 (Ubuntu) X-Content-Type-Options: nosniff X-Frame-Options: SAMEORIGIN |
|
电信
青海西宁
|
8.217.127.189 (香港香港阿里云) | 200 | 0.581s | 0.31s | 0.065s |
下载时间:0s 下载大小:7.33KB 下载速度:0KB/s HEAD:
HTTP/2.0 200 OK Cache-Control: no-cache, no-store, must-revalidate Content-Encoding: gzip Content-Type: text/html; charset=utf-8 Date: Tue, 10 Nov 2026 16:28:46 GMT Etag: W/"6a61cbb9-6225" Last-Modified: Thu, 23 Jul 2026 08:07:21 GMT Referrer-Policy: strict-origin-when-cross-origin Server: nginx/1.24.0 (Ubuntu) X-Content-Type-Options: nosniff X-Frame-Options: SAMEORIGIN |
|
电信
天津
|
8.217.127.189 (香港香港阿里云) | 200 | 1.434s | 1.29s | 0.043s |
下载时间:0s 下载大小:7.33KB 下载速度:0KB/s HEAD:
HTTP/2.0 200 OK Cache-Control: no-cache, no-store, must-revalidate Content-Encoding: gzip Content-Type: text/html; charset=utf-8 Date: Tue, 10 Nov 2026 16:28:47 GMT Etag: W/"6a61cbb9-6225" Last-Modified: Thu, 23 Jul 2026 08:07:21 GMT Referrer-Policy: strict-origin-when-cross-origin Server: nginx/1.24.0 (Ubuntu) X-Content-Type-Options: nosniff X-Frame-Options: SAMEORIGIN |
|
移动
甘肃庆阳
|
8.217.127.189 (香港香港阿里云) | 200 | 1.115s | 0.786s | 0.107s |
下载时间:0.001s 下载大小:7.33KB 下载速度:7330KB/s HEAD:
HTTP/2.0 200 OK Cache-Control: no-cache, no-store, must-revalidate Content-Encoding: gzip Content-Type: text/html; charset=utf-8 Date: Tue, 10 Nov 2026 16:28:47 GMT Etag: W/"6a61cbb9-6225" Last-Modified: Thu, 23 Jul 2026 08:07:21 GMT Referrer-Policy: strict-origin-when-cross-origin Server: nginx/1.24.0 (Ubuntu) X-Content-Type-Options: nosniff X-Frame-Options: SAMEORIGIN |
|
移动
广东广州
|
8.217.127.189 (香港香港阿里云) | 200 | 0.929s | 0.578s | 0.105s |
下载时间:0.001s 下载大小:7.33KB 下载速度:7330KB/s HEAD:
HTTP/2.0 200 OK Cache-Control: no-cache, no-store, must-revalidate Content-Encoding: gzip Content-Type: text/html; charset=utf-8 Date: Tue, 10 Nov 2026 16:28:46 GMT Etag: W/"6a61cbb9-6225" Last-Modified: Thu, 23 Jul 2026 08:07:21 GMT Referrer-Policy: strict-origin-when-cross-origin Server: nginx/1.24.0 (Ubuntu) X-Content-Type-Options: nosniff X-Frame-Options: SAMEORIGIN |
|
移动
广东广州
|
8.217.127.189 (香港香港阿里云) | 200 | 0.407s | 0.283s | 0.025s |
下载时间:0.001s 下载大小:7.33KB 下载速度:7330KB/s HEAD:
HTTP/2.0 200 OK Cache-Control: no-cache, no-store, must-revalidate Content-Encoding: gzip Content-Type: text/html; charset=utf-8 Date: Tue, 10 Nov 2026 16:28:46 GMT Etag: W/"6a61cbb9-6225" Last-Modified: Thu, 23 Jul 2026 08:07:21 GMT Referrer-Policy: strict-origin-when-cross-origin Server: nginx/1.24.0 (Ubuntu) X-Content-Type-Options: nosniff X-Frame-Options: SAMEORIGIN |
|
移动
河南洛阳
|
8.217.127.189 (香港香港阿里云) | 200 | 0.785s | 0.597s | 0.059s |
下载时间:0.001s 下载大小:7.33KB 下载速度:7330KB/s HEAD:
HTTP/2.0 200 OK Cache-Control: no-cache, no-store, must-revalidate Content-Encoding: gzip Content-Type: text/html; charset=utf-8 Date: Tue, 10 Nov 2026 16:28:46 GMT Etag: W/"6a61cbb9-6225" Last-Modified: Thu, 23 Jul 2026 08:07:21 GMT Referrer-Policy: strict-origin-when-cross-origin Server: nginx/1.24.0 (Ubuntu) X-Content-Type-Options: nosniff X-Frame-Options: SAMEORIGIN |
|
移动
黑龙江鸡西
|
8.217.127.189 (香港香港阿里云) | 200 | 0.669s | 0.419s | 0.079s |
下载时间:0s 下载大小:7.33KB 下载速度:0KB/s HEAD:
HTTP/2.0 200 OK Cache-Control: no-cache, no-store, must-revalidate Content-Encoding: gzip Content-Type: text/html; charset=utf-8 Date: Tue, 10 Nov 2026 16:28:46 GMT Etag: W/"6a61cbb9-6225" Last-Modified: Thu, 23 Jul 2026 08:07:21 GMT Referrer-Policy: strict-origin-when-cross-origin Server: nginx/1.24.0 (Ubuntu) X-Content-Type-Options: nosniff X-Frame-Options: SAMEORIGIN |
|
移动
江苏无锡
|
8.217.127.189 (香港香港阿里云) | 200 | 1.294s | 1.152s | 0.043s |
下载时间:0.001s 下载大小:7.33KB 下载速度:7330KB/s HEAD:
HTTP/2.0 200 OK Cache-Control: no-cache, no-store, must-revalidate Content-Encoding: gzip Content-Type: text/html; charset=utf-8 Date: Tue, 10 Nov 2026 16:28:47 GMT Etag: W/"6a61cbb9-6225" Last-Modified: Thu, 23 Jul 2026 08:07:21 GMT Referrer-Policy: strict-origin-when-cross-origin Server: nginx/1.24.0 (Ubuntu) X-Content-Type-Options: nosniff X-Frame-Options: SAMEORIGIN |
|
移动
内蒙古包头
|
8.217.127.189 (香港香港阿里云) | 200 | 0.706s | 0.423s | 0.091s |
下载时间:0s 下载大小:7.33KB 下载速度:0KB/s HEAD:
HTTP/2.0 200 OK Cache-Control: no-cache, no-store, must-revalidate Content-Encoding: gzip Content-Type: text/html; charset=utf-8 Date: Tue, 10 Nov 2026 16:28:46 GMT Etag: W/"6a61cbb9-6225" Last-Modified: Thu, 23 Jul 2026 08:07:21 GMT Referrer-Policy: strict-origin-when-cross-origin Server: nginx/1.24.0 (Ubuntu) X-Content-Type-Options: nosniff X-Frame-Options: SAMEORIGIN |
|
移动
山东青岛
|
8.217.127.189 (香港香港阿里云) | 200 | 0.812s | 0.634s | 0.055s |
下载时间:0s 下载大小:7.33KB 下载速度:0KB/s HEAD:
HTTP/2.0 200 OK Cache-Control: no-cache, no-store, must-revalidate Content-Encoding: gzip Content-Type: text/html; charset=utf-8 Date: Tue, 10 Nov 2026 16:28:46 GMT Etag: W/"6a61cbb9-6225" Last-Modified: Thu, 23 Jul 2026 08:07:21 GMT Referrer-Policy: strict-origin-when-cross-origin Server: nginx/1.24.0 (Ubuntu) X-Content-Type-Options: nosniff X-Frame-Options: SAMEORIGIN |
|
移动
山西长治
|
8.217.127.189 (香港香港阿里云) | 200 | 0.961s | 0.729s | 0.076s |
下载时间:0.001s 下载大小:7.33KB 下载速度:7330KB/s HEAD:
HTTP/2.0 200 OK Cache-Control: no-cache, no-store, must-revalidate Content-Encoding: gzip Content-Type: text/html; charset=utf-8 Date: Tue, 10 Nov 2026 16:28:46 GMT Etag: W/"6a61cbb9-6225" Last-Modified: Thu, 23 Jul 2026 08:07:21 GMT Referrer-Policy: strict-origin-when-cross-origin Server: nginx/1.24.0 (Ubuntu) X-Content-Type-Options: nosniff X-Frame-Options: SAMEORIGIN |
|
移动
西藏拉萨
|
8.217.127.189 (香港香港阿里云) | 200 | 1.058s | 0.66s | 0.128s |
下载时间:0.001s 下载大小:7.33KB 下载速度:7330KB/s HEAD:
HTTP/2.0 200 OK Cache-Control: no-cache, no-store, must-revalidate Content-Encoding: gzip Content-Type: text/html; charset=utf-8 Date: Tue, 10 Nov 2026 16:28:46 GMT Etag: W/"6a61cbb9-6225" Last-Modified: Thu, 23 Jul 2026 08:07:21 GMT Referrer-Policy: strict-origin-when-cross-origin Server: nginx/1.24.0 (Ubuntu) X-Content-Type-Options: nosniff X-Frame-Options: SAMEORIGIN |
|
移动
新疆昌吉回族自治州
|
8.217.127.189 (香港香港阿里云) | 200 | 0.952s | 0.585s | 0.118s |
下载时间:0s 下载大小:7.33KB 下载速度:0KB/s HEAD:
HTTP/2.0 200 OK Cache-Control: no-cache, no-store, must-revalidate Content-Encoding: gzip Content-Type: text/html; charset=utf-8 Date: Tue, 10 Nov 2026 16:28:46 GMT Etag: W/"6a61cbb9-6225" Last-Modified: Thu, 23 Jul 2026 08:07:21 GMT Referrer-Policy: strict-origin-when-cross-origin Server: nginx/1.24.0 (Ubuntu) X-Content-Type-Options: nosniff X-Frame-Options: SAMEORIGIN |
|
联通
北京
|
8.217.127.189 (香港香港阿里云) | 200 | 0.882s | 0.212s | 0.05s |
下载时间:0.3s 下载大小:7.33KB 下载速度:24.433KB/s HEAD:
HTTP/1.1 301 Moved Permanently Server: nginx/1.24.0 (Ubuntu) Date: Tue, 10 Nov 2026 16:28:46 GMT Content-Type: text/html Content-Length: 178 Connection: keep-alive Location: https://www.llins-tech.com/ HTTP/1.1 200 OK Server: nginx/1.24.0 (Ubuntu) Date: Tue, 10 Nov 2026 16:28:46 GMT Content-Type: text/html; charset=utf-8 Last-Modified: Thu, 23 Jul 2026 08:07:21 GMT Transfer-Encoding: chunked Connection: keep-alive ETag: W/"6a61cbb9-6225" X-Content-Type-Options: nosniff X-Frame-Options: SAMEORIGIN Referrer-Policy: strict-origin-when-cross-origin Cache-Control: no-cache, no-store, must-revalidate Content-Encoding: gzip |
|
联通
江西
|
8.217.127.189 (香港香港阿里云) | 200 | 0.883s | 0.056s | 0.062s |
下载时间:0.411s 下载大小:7.33KB 下载速度:17.835KB/s HEAD:
HTTP/1.1 301 Moved Permanently Server: nginx/1.24.0 (Ubuntu) Date: Tue, 10 Nov 2026 16:28:46 GMT Content-Type: text/html Content-Length: 178 Connection: keep-alive Location: https://www.llins-tech.com/ HTTP/1.1 200 OK Server: nginx/1.24.0 (Ubuntu) Date: Tue, 10 Nov 2026 16:28:46 GMT Content-Type: text/html; charset=utf-8 Last-Modified: Thu, 23 Jul 2026 08:07:21 GMT Transfer-Encoding: chunked Connection: keep-alive ETag: W/"6a61cbb9-6225" X-Content-Type-Options: nosniff X-Frame-Options: SAMEORIGIN Referrer-Policy: strict-origin-when-cross-origin Cache-Control: no-cache, no-store, must-revalidate Content-Encoding: gzip |
|
联通
甘肃庆阳
|
8.217.127.189 (香港香港阿里云) | 200 | 1.039s | 0.77s | 0.087s |
下载时间:0.001s 下载大小:7.33KB 下载速度:7330KB/s HEAD:
HTTP/2.0 200 OK Cache-Control: no-cache, no-store, must-revalidate Content-Encoding: gzip Content-Type: text/html; charset=utf-8 Date: Tue, 10 Nov 2026 16:28:46 GMT Etag: W/"6a61cbb9-6225" Last-Modified: Thu, 23 Jul 2026 08:07:21 GMT Referrer-Policy: strict-origin-when-cross-origin Server: nginx/1.24.0 (Ubuntu) X-Content-Type-Options: nosniff X-Frame-Options: SAMEORIGIN |
|
联通
广东深圳
|
8.217.127.189 (香港香港阿里云) | 200 | 0.619s | 0.569s | 0.012s |
下载时间:0.001s 下载大小:7.33KB 下载速度:7330KB/s HEAD:
HTTP/2.0 200 OK Cache-Control: no-cache, no-store, must-revalidate Content-Encoding: gzip Content-Type: text/html; charset=utf-8 Date: Tue, 10 Nov 2026 16:28:46 GMT Etag: W/"6a61cbb9-6225" Last-Modified: Thu, 23 Jul 2026 08:07:21 GMT Referrer-Policy: strict-origin-when-cross-origin Server: nginx/1.24.0 (Ubuntu) X-Content-Type-Options: nosniff X-Frame-Options: SAMEORIGIN |
|
联通
广西梧州
|
8.217.127.189 (香港香港阿里云) | 200 | 1.002s | 0.75s | 0.083s |
下载时间:0s 下载大小:7.33KB 下载速度:0KB/s HEAD:
HTTP/2.0 200 OK Cache-Control: no-cache, no-store, must-revalidate Content-Encoding: gzip Content-Type: text/html; charset=utf-8 Date: Tue, 10 Nov 2026 16:28:46 GMT Etag: W/"6a61cbb9-6225" Last-Modified: Thu, 23 Jul 2026 08:07:21 GMT Referrer-Policy: strict-origin-when-cross-origin Server: nginx/1.24.0 (Ubuntu) X-Content-Type-Options: nosniff X-Frame-Options: SAMEORIGIN |
|
联通
河北唐山
|
8.217.127.189 (香港香港阿里云) | 200 | 0.715s | 0.47s | 0.077s |
下载时间:0s 下载大小:7.33KB 下载速度:0KB/s HEAD:
HTTP/2.0 200 OK Cache-Control: no-cache, no-store, must-revalidate Content-Encoding: gzip Content-Type: text/html; charset=utf-8 Date: Tue, 10 Nov 2026 16:28:46 GMT Etag: W/"6a61cbb9-6225" Last-Modified: Thu, 23 Jul 2026 08:07:21 GMT Referrer-Policy: strict-origin-when-cross-origin Server: nginx/1.24.0 (Ubuntu) X-Content-Type-Options: nosniff X-Frame-Options: SAMEORIGIN |
|
联通
河南平顶山
|
8.217.127.189 (香港香港阿里云) | 200 | 0.733s | 0.507s | 0.069s |
下载时间:0s 下载大小:7.33KB 下载速度:0KB/s HEAD:
HTTP/2.0 200 OK Cache-Control: no-cache, no-store, must-revalidate Content-Encoding: gzip Content-Type: text/html; charset=utf-8 Date: Tue, 10 Nov 2026 16:28:46 GMT Etag: W/"6a61cbb9-6225" Last-Modified: Thu, 23 Jul 2026 08:07:21 GMT Referrer-Policy: strict-origin-when-cross-origin Server: nginx/1.24.0 (Ubuntu) X-Content-Type-Options: nosniff X-Frame-Options: SAMEORIGIN |
|
联通
湖北宜昌
|
8.217.127.189 (香港香港阿里云) | 200 | 0.69s | 0.47s | 0.068s |
下载时间:0.001s 下载大小:7.33KB 下载速度:7330KB/s HEAD:
HTTP/2.0 200 OK Cache-Control: no-cache, no-store, must-revalidate Content-Encoding: gzip Content-Type: text/html; charset=utf-8 Date: Tue, 10 Nov 2026 16:28:46 GMT Etag: W/"6a61cbb9-6225" Last-Modified: Thu, 23 Jul 2026 08:07:21 GMT Referrer-Policy: strict-origin-when-cross-origin Server: nginx/1.24.0 (Ubuntu) X-Content-Type-Options: nosniff X-Frame-Options: SAMEORIGIN |
|
联通
湖南衡阳
|
8.217.127.189 (香港香港阿里云) | 200 | 0.691s | 0.475s | 0.068s |
下载时间:0s 下载大小:7.33KB 下载速度:0KB/s HEAD:
HTTP/2.0 200 OK Cache-Control: no-cache, no-store, must-revalidate Content-Encoding: gzip Content-Type: text/html; charset=utf-8 Date: Tue, 10 Nov 2026 16:28:46 GMT Etag: W/"6a61cbb9-6225" Last-Modified: Thu, 23 Jul 2026 08:07:21 GMT Referrer-Policy: strict-origin-when-cross-origin Server: nginx/1.24.0 (Ubuntu) X-Content-Type-Options: nosniff X-Frame-Options: SAMEORIGIN |
|
联通
江苏徐州
|
8.217.127.189 (香港香港阿里云) | 200 | 0.989s | 0.695s | 0.081s |
下载时间:0.002s 下载大小:7.33KB 下载速度:3665KB/s HEAD:
HTTP/2.0 200 OK Cache-Control: no-cache, no-store, must-revalidate Content-Encoding: gzip Content-Type: text/html; charset=utf-8 Date: Tue, 10 Nov 2026 16:28:46 GMT Etag: W/"6a61cbb9-6225" Last-Modified: Thu, 23 Jul 2026 08:07:21 GMT Referrer-Policy: strict-origin-when-cross-origin Server: nginx/1.24.0 (Ubuntu) X-Content-Type-Options: nosniff X-Frame-Options: SAMEORIGIN |
|
联通
辽宁盘锦
|
8.217.127.189 (香港香港阿里云) | 200 | 0.829s | 0.542s | 0.092s |
下载时间:0s 下载大小:7.33KB 下载速度:0KB/s HEAD:
HTTP/2.0 200 OK Cache-Control: no-cache, no-store, must-revalidate Content-Encoding: gzip Content-Type: text/html; charset=utf-8 Date: Tue, 10 Nov 2026 16:28:46 GMT Etag: W/"6a61cbb9-6225" Last-Modified: Thu, 23 Jul 2026 08:07:21 GMT Referrer-Policy: strict-origin-when-cross-origin Server: nginx/1.24.0 (Ubuntu) X-Content-Type-Options: nosniff X-Frame-Options: SAMEORIGIN |
|
联通
山东烟台
|
8.217.127.189 (香港香港阿里云) | 200 | 1.019s | 0.774s | 0.077s |
下载时间:0s 下载大小:7.33KB 下载速度:0KB/s HEAD:
HTTP/2.0 200 OK Cache-Control: no-cache, no-store, must-revalidate Content-Encoding: gzip Content-Type: text/html; charset=utf-8 Date: Tue, 10 Nov 2026 16:28:47 GMT Etag: W/"6a61cbb9-6225" Last-Modified: Thu, 23 Jul 2026 08:07:21 GMT Referrer-Policy: strict-origin-when-cross-origin Server: nginx/1.24.0 (Ubuntu) X-Content-Type-Options: nosniff X-Frame-Options: SAMEORIGIN |
|
联通
陕西渭南
|
8.217.127.189 (香港香港阿里云) | 200 | 0.939s | 0.695s | 0.079s |
下载时间:0.001s 下载大小:7.33KB 下载速度:7330KB/s HEAD:
HTTP/2.0 200 OK Cache-Control: no-cache, no-store, must-revalidate Content-Encoding: gzip Content-Type: text/html; charset=utf-8 Date: Tue, 10 Nov 2026 16:28:46 GMT Etag: W/"6a61cbb9-6225" Last-Modified: Thu, 23 Jul 2026 08:07:21 GMT Referrer-Policy: strict-origin-when-cross-origin Server: nginx/1.24.0 (Ubuntu) X-Content-Type-Options: nosniff X-Frame-Options: SAMEORIGIN |
查询结果仅供参考,不保证100%准确。
最新检测
网站测速
PING检测
劫持检测