单项选择题
A.0.5m B.0.6m C.0.7m D.0.8m
A.8% B.10% C.15% D.18%
A.后退向下,自重切土 B.直上直下,白重切土 C.前进向上,强制切土 D.后退向下,强制切土
A.5% B.10% C.15% D.20%
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