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下面圖中,那個(gè)設(shè)計(jì)合理,理由是什么?謝謝指導(dǎo) |
點(diǎn)評
12#已經(jīng)貼出來了。
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點(diǎn)評
還有澆鑄時(shí)鐵水能旋起來利于雜質(zhì)浮出。
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