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问题
选择题
Help! Wang Qiang _____ an accident.
A. was having
B. had had
C. has had
D. will have
答案
答案:
C
判断题
对于混凝土配合比设计,首次使用的混凝土配合比应进行开盘鉴定,其工作性应满足设计配合比的要求。( )
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名词解释
硅质岩
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