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【单选题】
绘制铸造工艺图时,浇注位置选择的原则之一是将铸件的面朝下,主要是( )。
A.
B.
浇不足
C.
气孔
D.
夹砂
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A.
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B.
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C.
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D.
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A.
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B.
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C.
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D.
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E.
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A.
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B.
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C.
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