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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(píng)
12#已經(jīng)貼出來(lái)了,。
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點(diǎn)評(píng)
還有澆鑄時(shí)鐵水能旋起來(lái)利于雜質(zhì)浮出,。
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