A.23.5%~24.5%
B.20.5%~21.5%
C.19.0%~20.0%
D.17.5%~18.5%
[单选题]A.25B.10+5πC.50D.πE.50+π
[单选题]A.25B.10+5πC.50D.πE.50+π
[单选题]A.23.5%~24.5%B.20.5%~21.5%C.19.0%~20.0%D.17.5%~18.5%
[单选题]A.①③B.②③C.①④D.②④
[单选题]A.①③B.②③C.①④D.②④
[单选题]A.5B.8.6C.10D.17.3
[单选题]A.0.003cm/sB.0.006cm/sC.0.009cm/sD.0.012cm/s
[单选题]A.500mA,2.5mAB.8mA,8mAC.6mA,2.5mAD.6mA,4.5mA