A.第一种
B.第二种
C.第三种
D.第四种
[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.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