单项选择题
A.0.5m B.1m C.1.5m D.2m
A.3 B.5 C.7 D.14
A.1%~2%B.2%~3%C.3%~5%D.5%~10%
A.0.5~1.0 B.1.0~1.5 C.1.5~2.0 D.2.0~2.5
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