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【单选题】
质量分别为m和M的两物体叠放在水平面上如图所示，两物体之间及M与水平面间的动摩擦因数均为μ。现对M施加一个水平力F，则以下说法中不正确的是（）A.
若两物体一起向右匀速运动，则M受到的摩擦力等于F
B.
若两物体一起向右匀速运动，则m与M间无摩擦，M受到水平面的摩擦力大小等于mg
C.
若两物体一起以加速度a向右运动，M受到的摩擦力的大小等于F-Ma
D.
若两物体一起以加速度a向右运动，M受到的摩擦力大小等于μ（m+M）g+ma
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【单选题】Which of the following statements is NOT true, according to the passage you have just heard?
A.
Most of the kids who joined the gang live in slums.
B.
The policemen are very effective as they are expected.
C.
Gangs are also doing some recruiting propaganda.
D.
Television violence has also an influence on children.
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