P:2009-10-03 22:17:50
1
UL1581和UL2556只是對耐摩擦試驗(yàn)的試驗(yàn)速度,試驗(yàn)儀器進(jìn)行了規(guī)定,UL2556說砝碼重量參考產(chǎn)品標(biāo)準(zhǔn)(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?
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