A.1.8% B.2.3% C.2.9% D.3.4%
A.25 B.28 C.16.67 D.17.33
A.212.17 B.216.17 C.218.06 D.220.17
A.-2 B.2 C.18 D.20
A.可有可无 B.有 C.没有 D.条件不够
A.30 B.34.29 C.41.60 D.48