单项选择题
A.3~5块 B.5~10块 C.10~15块 D.15~20块
A.95% B.5% C.0.95%
A.砂砾石 B.碎石土 C.黏性土
A.0.1 B.0.2~0.25 C.0.5 D.1.0
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