8063| 22
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這個(gè)臺(tái)階結(jié)構(gòu)不方便加工螺紋孔,怎么改進(jìn)? |
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點(diǎn)評(píng)
或許可以從外側(cè)打
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點(diǎn)評(píng)
想多一點(diǎn),無(wú)用處通大孔,臺(tái)階狀。
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