17.如下图所示放在斜面上静止的物体下列说法正确的是 A.只受重力作用 b.只受重力和支持力的作用 c.既受重力作用还要受支持力和压力 Template




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tomski17.如下图所示放在斜面上静止的物体下列说法正确的是 a.只受重力作用 b.只受重力和支持力的作用 coloring