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【单选题】
动轮踏面有1:20及( )锥度的两段斜面。A.
1:10
B.
1:12
C.
1:15
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【单选题】测定混凝土用的标准试件尺寸为( )。 A B C
A.
150×150×150mm
B.
100×100×100mm
C.
200×200×200mm
D.
70.7×70.7×70.7mm
【单选题】测定混凝土用的标准试件尺寸为（ ）。
A.
150×150×150mm
B.
100×100×100mm
C.
70.7×70.7×70.7mm
D.
120×120×120mm
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