A.0.21m/s
B.0.115m/s
C.0.105m/s
D.0.0525m/s
[单选题]A.0.21m/sB.0.115m/sC.0.105m/sD.0.0525m/s
[单选题]A.0.21m/sB.0.115m/sC.0.105m/sD.0.0525m/s
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[单选题]是( )A.B.C.D.
[单选题]是( )A.B.C.D.
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[单选题]A.12B.11C.10D.9E.8