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【单选题】
如图,质量为m的小球,放在光滑的木板和光滑的墙壁之间,并保持平衡,设木板和墙壁之间的夹角为 ,当 增大时,小球对木板的压力将:A.
增加;
B.
减少;
C.
不变;
D.
先是增加,后又减少,压力增减的分界角为a=45°。
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