如图所示，水平面上，质量为m的物块受到与水平方向夹角θ的推力F

如图所示，水平面上，质量为m的物块受到与水平方向夹角θ的推力F的作用（θ≠0），物块做匀速直线运动．现将F撤去，设此后物块运动过程中加速度的大小为a，则（　　）

A．a=0 B． C． D．

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如图所示，水平面上，质量为m的物块受到与水平方向夹角θ的推力F

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