单项选择题

二分液的组分各是什么()

A.Ur:64.5%;C:0.44%;N:0.7%;H:31.4%
B.Ur:65.5%;C:0.44%;N:0.7%;H:31.4%
C.Ur:67.5%;C:0.44%;N:0.7%;H:31.4%
D.Ur:66.5%;C:0.44%;N:0.7%;H:31.4%