1.一个重60N的物体置于光滑的水平面上,当用一个F=20N的力竖直向上拉物体时物 体所受的合力为A.0N B.40N,方向竖直向下 C.40N,方向竖直向上D.80N,方向竖直向上2.一只普通白炽灯,用多用电表测得灯
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![1.一个重60N的物体置于光滑的水平面上,当用一个F=20N的力竖直向上拉物体时物 体所受的合力为A.0N B.40N,方向竖直向下 C.40N,方向竖直向上D.80N,方向竖直向上2.一只普通白炽灯,用多用电表测得灯](/uploads/image/z/4890065-41-5.jpg?t=1.%E4%B8%80%E4%B8%AA%E9%87%8D60N%E7%9A%84%E7%89%A9%E4%BD%93%E7%BD%AE%E4%BA%8E%E5%85%89%E6%BB%91%E7%9A%84%E6%B0%B4%E5%B9%B3%E9%9D%A2%E4%B8%8A%2C%E5%BD%93%E7%94%A8%E4%B8%80%E4%B8%AAF%3D20N%E7%9A%84%E5%8A%9B%E7%AB%96%E7%9B%B4%E5%90%91%E4%B8%8A%E6%8B%89%E7%89%A9%E4%BD%93%E6%97%B6%E7%89%A9+%E4%BD%93%E6%89%80%E5%8F%97%E7%9A%84%E5%90%88%E5%8A%9B%E4%B8%BAA.0N+B.40N%2C%E6%96%B9%E5%90%91%E7%AB%96%E7%9B%B4%E5%90%91%E4%B8%8B+C.40N%2C%E6%96%B9%E5%90%91%E7%AB%96%E7%9B%B4%E5%90%91%E4%B8%8AD.80N%2C%E6%96%B9%E5%90%91%E7%AB%96%E7%9B%B4%E5%90%91%E4%B8%8A2.%E4%B8%80%E5%8F%AA%E6%99%AE%E9%80%9A%E7%99%BD%E7%82%BD%E7%81%AF%2C%E7%94%A8%E5%A4%9A%E7%94%A8%E7%94%B5%E8%A1%A8%E6%B5%8B%E5%BE%97%E7%81%AF)
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