单项选择题
A.全开 B.1/2 C.2/3 D.全关
A.1/3-1/2 B.1/2-2/3 C.2/3-3/4 D.1/3-2/3
A.45-50 B.50-60 C.53-60 D.60-65
A.0.4 B.0.45 C.0.5 D.0.55
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