紧固云
B8 and B8M怎么理解？？急
B8 and B8M怎么理解？？急
LV.1初出茅庐
2008-10-15
it is standard threaded bar 10 - 12 feet long in all sizes from 1/2" to 1 1/2" the specifications are B8 and B8M class 2
这里的B8 and B8M怎么理解
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紧固云it is standard threaded bar 10 - 12 feet long in all sizes from 1/2" to 1 1/2" the specifications are B8 and B8M class 2
这里的B8 and B8M怎么理解