单项选择题
A.10° B.15° C.20° D.25°
A.1.5 B.2.0 C.2.5 D.3.0
A.70 B.80 C.90 D.100
A.0.8~1.1 B.0.9~1.2 C.1.0~1.3 D.1.2~1.5
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