题目内容
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[单选题]
For industrial purposes, materials are divided into engineering materials or（) materi
A.metal
B.ceramic
C.polymer
D.nonengineering
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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.metal
B.ceramic
C.polymer
D.nonengineering
如果结果不匹配，请 联系老师 获取答案
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