单项选择题
A.吊更 B.抵埂 C.撂埂 D.搭跳
A.3.0mB.4.0m C.-0.5m D.3.5m
A.0.1~0.2 B.0.1~0.3 C.0.2~0.3 D.0.2
A.① B.② C.①②都对 D.①②都不对
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