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【单选题】
工业生产中黄铜的含锌量不超过47%。含锌量小于()时,锌全部溶于铜中,形成α固溶体,称为单相黄铜。
A.
30%
B.
35%
C.
39%
D.
39%~45%
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参考答案:
举一反三
【判断题】目前已经有科学家发现,有体外寄生虫存在于人体体表中。()
A.
正确
B.
错误
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