A.14
B.16
C.18
D.20
[单选题]A.14B.16C.18D.20
[单选题]A.14B.16C.18D.20
[单选题]A.14B.16C.18D.20
[单选题]A.14B.16C.18D.20
[单选题]A.0.944B.0.504C.0.006D.0.994
[单选题]A.0.944B.0.504C.0.006D.0.994
[单选题]A.0.944B.0.504C.0.006D.0.994
[单选题]A.0.944B.0.504C.0.006D.0.994
[单选题]A.14B.16C.18D.20
[单选题]A.第一种B.第二种C.第三种D.第四种