如图所示把系在轻绳上的ab两球由图示位置同时由静止释放则在两球�左下�动时下列说法正确的是 �绳oa对a球做正功 �绳ab对b球不 Template




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tomski如图所示把系在轻绳上的ab两球由图示位置同时由静止释放则在两球�左下�动时下列说法正确的是 �绳oa对a球做正功 �绳ab对b球不 coloring