A.0.8
B.1.0
C.1.14
D.0.9
[判断题]A.对B.错
[单选题]A.B.πC.2πln2D.πln2
[单选题]A.B.x=2tC.D.
[单选题]A.5B.10C.15D.20
[问答题]------------.