真是一个好问题
This standard is issued under the fixed designation A179/A179M; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
A superscript epsilon (′) indicates an editorial change since the last revision or reapproval.
90a应该是上一次改版为90年，括号内的2012是被重新核准(reapproval)的年份
奇怪，我的回复怎么看不到，再贴一次
90a是上次改版的年份，括号内是重新批准的年份
This standard is issued under the fixed designation A179/A179M; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
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雷达卡
发表于 2014-3-13 15:03:52
提升卡
置顶卡
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喧嚣卡
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抢沙发
千斤顶
显身卡
发表于 2014-3-22 15:13:59
发表于 2014-3-30 13:32:18
