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【单选题】
某建筑物地下室,基础,基础做防水层,采用四面放坡挖土,边坡坡度为 1:0.5 ,设工作面从垫层边缘算起,则该地下室挖土时坑底尺寸为( ),坑顶尺寸为( )。
A.
30m×20m , 33.05 m×23.05m
B.
30.15m×20.15m , 33.15 m×23.15m
C.
33m×23m , 36.05 m×26.05m
D.
30.4m×20.4m , 33.45 m×23.45m
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