单项选择题
A.5% B.10% C.15% D.20%
A.0.5%~1% B.1%~3% C.3%~5% D.5%~6%
A.0.5% B.1% C.1.5% D.2%
A.0.5%/min~1%/min B.1%/min~3%/min C.3%/min~4%/min D.4%/min~5%/min
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