题目内容
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[单选题]
A riser is an extra void created in the mold to contain（)molten material
A.poured
B.injected
C.much
D.excessive
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题目内容
（请给出正确答案）
如果结果不匹配，请 联系老师 获取答案
题目内容
（请给出正确答案）
A.poured
B.injected
C.much
D.excessive
如果结果不匹配，请 联系老师 获取答案
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