单项选择题
A.5/8H B.1/8H C.1/4H D.3/8H
A.d-0.6495.P B.0.6495.P C.d-1.082.P D.0.5413.P
A.1:20 B.1:10 C.1:15 D.1:16
A.30°和55° B.30°和40° C.55°和60° D.55°和30°
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