单项选择题
A.0.0016B.0.2C.0.9D.1
A.90B.200C.1440D.2880
A.13名B.55名C.56名D.111名
A.3B.2C.5D.4
A.45B.36C.18D.15
A.23B.5C.6D.9
A.240B.180C.120D.80
A.80B.160C.200D.210
A.5880种B.2940种C.1960种D.490种
A.90%B.81%C.70%D.68%
A.1200B.3600C.4800D.7200