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引用第5楼大侠风清扬于2009-07-21 11:33发表的 :( B3 I, \+ S) \
所有的美标规定,括号外的是要求值,括号内的是参考值,这个没有疑问了,我在某本美标上看到过, 如果需要我可以查一下这个
) y# g, B9 l1 f7 li think my opinion is absolutely correct.& T8 ?9 N. s: H! ?) i
see following clause, it is common in UL standard. i just pick it from UL 1004.2 e* ^5 R6 H2 @/ c9 [2 A4 c2 v
, T6 y& }& @8 J3 S3 Units of Measurement( w6 ~ ~$ L+ q9 A
3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or5 s& o3 p+ J! X4 j6 p
approximate information. |
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