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請(qǐng)問(wèn)這種圖形怎么標(biāo)注合理,? |
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點(diǎn)評(píng)
你都注意到這一點(diǎn),說(shuō)明這個(gè)肯定是1/4圓弧截去了一部分,,為啥不標(biāo)出來(lái)呢
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點(diǎn)評(píng)
不是同心圓,,厚度能恒定嗎
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