A.30%~40%
B.40%~50%
C.50%~60%
D.65%~70%
E.80%左右
[单选题]A.30%~40%B.40%~50%C.50%~60%D.65%~70%E.80%左右
[单选题]A.B.C.D.
[单选题]A.B.C.D.E.
[判断题]A.对B.错
[单选题]A.πB.C.D.
[单选题]A.2B.C.D.1