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落砂前铸件在型腔里停留多长时间？
How long does the casting stay in the mold before shake?
youdao
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新腔一唱双金斗，正霜落、分甘手。
Kim Doo-new dual-chamber of a singing, is cream off, sub-Gan hand.
youdao
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新腔一唱双金斗，正霜落、分甘手。
Kim Doo-new dual-chamber of a singing, is cream off, sub-Gan hand.
youdao