吊篮所受的重力为400N,动滑轮重为50N,定滑轮所受重力为40N,人所受的重力为600N,人在吊篮里拉着绳子不动时人需用力( )A.218N B.220N C.210N D.236N
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![吊篮所受的重力为400N,动滑轮重为50N,定滑轮所受重力为40N,人所受的重力为600N,人在吊篮里拉着绳子不动时人需用力( )A.218N B.220N C.210N D.236N](/uploads/image/z/2016040-40-0.jpg?t=%E5%90%8A%E7%AF%AE%E6%89%80%E5%8F%97%E7%9A%84%E9%87%8D%E5%8A%9B%E4%B8%BA400N%2C%E5%8A%A8%E6%BB%91%E8%BD%AE%E9%87%8D%E4%B8%BA50N%2C%E5%AE%9A%E6%BB%91%E8%BD%AE%E6%89%80%E5%8F%97%E9%87%8D%E5%8A%9B%E4%B8%BA40N%2C%E4%BA%BA%E6%89%80%E5%8F%97%E7%9A%84%E9%87%8D%E5%8A%9B%E4%B8%BA600N%2C%E4%BA%BA%E5%9C%A8%E5%90%8A%E7%AF%AE%E9%87%8C%E6%8B%89%E7%9D%80%E7%BB%B3%E5%AD%90%E4%B8%8D%E5%8A%A8%E6%97%B6%E4%BA%BA%E9%9C%80%E7%94%A8%E5%8A%9B%28+%29A.218N+B.220N+C.210N+D.236N)
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