HD 21.3 S3:1995
Polyvinyl chloride insulated cables of rated voltages up to and including 450/750 V -
Part 3: Non-sheathed cables for fixed wiring
HD 21.3 S3:1995/A1:1999
HD 21.3 S3:1995/FprA2:January 2008 (FINAL DRAFT)
太贵了
一点儿就不值钱,只要是国外的标准,不管有没有价值,就要那么多金币和威望。哎!悲哀呀!