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一直有個(gè)簡(jiǎn)單的小問題困擾著我 |
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點(diǎn)評(píng)
螺栓的國(guó)標(biāo)號(hào),可不止是外形尺寸這么簡(jiǎn)單。,。符合某國(guó)標(biāo),,那么材料(不是唯一)也必須符合國(guó)標(biāo)中規(guī)定的某種材料。
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