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【单选题】
如图所示,在倾角为θ的固定光滑斜面上,放一质量为m的光滑小球,球被竖直的木板挡住,在把竖直木板迅速拿开的这一瞬间,小球获得的加速度为( )。
A.
gsin θ
B.
gcos θ
C.
g/sin θ
D.
g/cos θ
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