单项选择题
A.1/2 B.1/5 C.1/4 D.1/3
A.3°～5° B.1°～3° C.5°～7° D.7°～9°
A.10%～30% B.30%～50% C.50%～70% D.70%～90%
A.0.3～0.4 B.0.1～0.2 C.0.2～0.3 D.0.4～0.5
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