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螺絲和螺栓有什么區(qū)別 |
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點(diǎn)評(píng)
看了一下標(biāo)準(zhǔn),是的,,大學(xué)學(xué)的都忘了
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點(diǎn)評(píng)
這是通常定義,,當(dāng)然可以這樣用。
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