单项选择题
A.2% B.1.5% C.1% D.0.5%
A.10° B.15° C.20° D.25°
A.5‰ B.4‰ C.3‰ D.2‰
A.0.8～1.1 B.0.9～1.2 C.1.0～1.3 D.1.2～1.5
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