21486| 21
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關(guān)于腰型孔的標(biāo)注 |
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點(diǎn)評(píng)
我覺的第一種加工并不方便,而是方便檢測(cè)了。
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點(diǎn)評(píng)
第一種是國標(biāo)(還不完整的畫法)
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