4099| 17
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一直有個(gè)簡單的小問題困擾著我 |
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點(diǎn)評
螺栓的國標(biāo)號,可不止是外形尺寸這么簡單,。,。符合某國標(biāo),那么材料(不是唯一)也必須符合國標(biāo)中規(guī)定的某種材料,。
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