单项选择题
A.2%~4% B.30%~50% C.2%~21% D.40%~60%
A.5.50% B.10.30% C.12.20% D.5.30%
A.90° B.120° C.60° D.180°
A.≥10 B.15~50 C.25~30 D.25~45
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