单项选择题
A.80mm B.100mm C.120mm D.150mm
A.1:1.2 B.1:1.5 C.1:2 D.1:2.5
A.先支后挖B.均衡分层C.整体开挖D.对称开挖
A.300 B.400 C.500 D.600
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