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請(qǐng)問(wèn)貫穿的方形孔這樣標(biāo)注可以嗎 |
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點(diǎn)評(píng)
對(duì),一般通孔不需要專門(mén)標(biāo)注。不是通孔反而需要特別說(shuō)明。
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