单项选择题
A.4 B.3 C.2 D.1
A.0.8 B.0.9 C.0.5 D.0.6
A.0.5 B.0.6 C.0.7 D.0.8
A.5 B.4 C.3 D.2
A.0.2/1000 B.0.5/1000 C.0.8/1000 D.1.0/1000
A.3.5 B.3.0 C.2.0 D.1.5
A.4/1000 B.3/1000 C.2/1000 D.1/1000
A.1/1000 B.2/1000 C.3/1000 D.4/1000
A.0.5 B.1 C.1.5 D.2
A.1/10 B.1/100 C.1/1000 D.2/1000
A.5~10 B.1~5 C.10~15 D.15~20