A.
B.
C.
D.
[单选题]A.1.5B.1.25C.1D.0.75
[单选题]A.1100B.1200C.1250D.1300
[单选题]A.逐渐减小B.逐渐增大C.保持不变D.可能增大,也可能减小
[单选题]A.0.885m/sB.1.980m/sC.1.770m/sD.2.000m/s
[单选题]A.500WB.866WC.1000WD.1988W
[单选题]A.0.6级B.0.5级C.1.0级D.0.4级
[单选题]A.2.17B.13.9C.6.42D.2.96