
A.49.6%
B.50.6%
C.51.1%
D.51.6%
[单选题]A.2.81m,1.99mB.2.91m,2.09mC.2.91m,2.19mD.3.11m,2.29m
[单选题]A.2.81m,1.99mB.2.91m,2.09mC.2.91m,2.19mD.3.11m,2.29m
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[单选题]( ).A.B.C.D.
[问答题]--------------.
[问答题]--------------.
[单选题]A.B.C.D.E.A、B、C、D都不正确
[单选题]A.1B.2C.3D.4E.5
[单选题]A.-2<m<-1B.-4<m<-1C.-4<m<-2D.-3<m<1E.A、B、C、D均不正确
[单选题]A.n=lB.n=2C.n=3D.n=4