P:2009-10-03 22:17:50
1
UL1581和UL2556只是對耐摩擦試驗的試驗速度,試驗儀器進行了規(guī)定,UL2556說砝碼重量參考產(chǎn)品標準(The other end of each specimen shall be attached to a weight as defined in the product standard)。請問這個product standard 是什么?
two-roll straightening machine - 雙輥矯直機 (0) 投訴