单项选择题
A.65%~92% B.65%~75% C.75%~92% D.70%~90%
A.1.5~1.8 B.1.2~1.4 C.1.7~2.5 D.2.5~5.0
A.120度 B.130度 C.155度 D.180度
A.45% B.50% C.55% D.60%
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