单项选择题
A.基底 B.基坑 C.凹槽 D.基垫
A.32.5 B.42.5 C.47.5 D.37.5
A.1:0.75 B.1:1 C.1:0.5 D.1:0.67
A.20°~35° B.35°~50° C.45°~60° D.40°~55°
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