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题１重９８牛的物体放在地面上、下列说法正确的是：Ａ．它对地面压力的大小一定等于９８牛；Ｂ．它对地面压力的大小不一定等于９８牛；Ｃ．物体受到的重力就是它对地面的压力；Ｄ．如果地面是水平的，物体所受到的重力就是它对地面的压力．解析首先应当明白压力和重力是性质
Item 1 weight 98 cattle objects on the ground, the following statement is correct: A. Its pressure on the ground must be equal to 98 cattle; B. Its magnitude of ground pressure is not necessarily equal to 98 cattle; C. The gravity of an object is its pressure on the ground; D. If the ground is horizontal, the gravity of the object is its pressure on the ground. The analysis should first understand that pressure and gravity are properties