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1014| 12
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內(nèi)、外螺紋產(chǎn)品基準(zhǔn) |
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點(diǎn)評(píng)
GB/T 9151.1這個(gè)標(biāo)準(zhǔn)存在嗎?
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點(diǎn)評(píng)
從1999發(fā)布以來,這份標(biāo)準(zhǔn)一直就沒ABC基準(zhǔn)的定義的呀!
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