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[单选题]
毛石混凝土基础的阶梯高度一般不得小于()
A.100mm
B.200mm
C.300mm
D.400mm
![](https://lstatic.shangxueba.com/sxbzda/h5/images/tips_org.png)
A.100mm
B.200mm
C.300mm
D.400mm
第7题
A.67.93
B.73.26
C.77.53
D.104.34
第8题
A.400,200
B.500,200
C.400,300
D.500,300
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