单项选择题
A.0.75~0.8B.0.8~0.85C.0.85~0.9D.0.95~1.0
A.2~3.5B.2.5~4C.3~4.5D.3.5~5
A.4~10B.4.5~10.5C.5~11D.5.5~11.5
A.10°~20°B.15°~25°C.20°~30°D.25°~35°
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