单项选择题
A.0.5~0.8 B.0.5~1.0 C.0.8~1.0 D.1.0~1.5
A.30° B.45° C.60° D.90°
A.1% B.1.5% C.2% D.3%
A.2 B.3 C.4 D.5
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