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制圖教材上說(shuō)對(duì)稱(chēng)結(jié)構(gòu)的尺寸不能只標(biāo)注一半,為什么? |
點(diǎn)評(píng)
加上未注公差呢
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點(diǎn)評(píng)
請(qǐng)問(wèn)你的零件中心在哪,言之鑿鑿的對(duì)中心線有什么誤解
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