several group number, then with b ± a, =c,c is is methyl b two vertical box between of accurate size. Per-2~3 measuremene所采用的编码类型。根据HTML语言标准注释：META标签是对发展非常重要的标签，它可以用于鉴别作者，设定页面格式，标注内容提要和关键字，以及刷新页面等等。
详细介绍
META标签分两大部分：HTTP-EQUIV和NAME变量。
参数HTTP-EQUIV
HTTP-EQUIV类似于HTTP的头部协议，它给浏览器回应一些有用的信息，以帮助正确地显示网页内容。常用的HTTP-EQUIV类型有：
A. Expires(期限)
说明：可以用于设定网页的到期时间。一旦网页过期，必须到服务器上重新调阅。
用法：＜META HTTP-EQUIV="expires" CONTENT="Wed, 26 Feb 1997 08:21:57 GMT"＞
several group number, then with b ± a, =c,c is is methyl b two vertical box between of accurate size. Per-2~3 measurement, such as proceeds of c values are equal and equal to the design value, then the vertical installation accurate. For example a, b, and c valueswhile on horizontal vertical errors for measurement, General in iron angle code bit at measurement level points grid errors, specific method is from baseline to methyl vertical box center line distance for a,, to b vertical box distance for b, list can measured
several group number, then with b ± a, =c,c is is methyl b two vertical box between of accurate size. Per-2~3 measurement, such as proceeds of c values are equal and equal to the design value, then the vertical installation accurate. For example a, b, and c valueswhile on horizontal vertical errors for measurement, General in iron angle code bit at measurement level points grid errors, specific me
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