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1、定滑輪:①定義:中間的軸固定不動的滑輪.②實質:定滑輪的實質是:等臂杠杆③特點:使用定滑輪不能省力但是能改變動力的方向. 2、動滑輪:①定義:和重物一起移動的滑輪.②實質:動滑輪的實質是:動力臂…
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