单项选择题
A.60° B.120° C.240° D.270°
A.600KM/h B.960KM/h C.540KM/h D.480KM/h
A.10:12,8′ B.10:10,10′ C.10:15,5′ D.10:18,8′
A.10 B.16 C.18 D.15
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