题目内容
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[单选题]
The metal powder is compacted by placing in a closed（)cavity under pressure in powder
A.plastic
B.metal
C.wood
D.sand
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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.plastic
B.metal
C.wood
D.sand
如果结果不匹配，请 联系老师 获取答案
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