单项选择题
A.0.02 B.0.20 C.0.80 D.1.80
A.0.50~1.50 B.2.0~3.0 C.4.50~5.0 D.5.0~6.0
A.0.04-0.07 B.0.40-0.70 C.1.04-1.07