单项选择题
A.3 B.5 C.7 D.9
A.0.70~1.00 B.0.71~1.07 C.0.73~1.09 D.0.75~1.07
A.60°B.90°C.120°D.180°
A.40~50 B.45~55 C.50~60 D.65~75
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