单项选择题
A.84 B.42 C.100 D.50
A.30 B.55 C.70 D.74
A.5 B.6 C.7 D.8
A.17 B.15 C.14 D.12
A.17 B.21 C.25 D.29
A.11 B.15 C.18 D.21
A.0.768 B.0.800 C.0.896 D.0.924
A.小于10% B.10% C.20% D.大于20%
A.48 B.72 C.90 D.120
A.210 B.260 C.420 D.840