下列对物体受力情况分析中属于平衡力的是 A.人站在地面上人对地面的压力和地面对人的支持力b.汽车运动时汽车所受的牵引力和阻力c.跳伞 Template




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tomski下列对物体受力情况分析中属于平衡力的是 a.人站在地面上人对地面的压力和地面对人的支持力b.汽车运动时汽车所受的牵引力和阻力c.跳伞 coloring