题型:画图题 四季知识我来填。 How's the weater?What do you wear?What do you like to do?winter spring summer fall 查看答案
题型:填空题 如图所示,物体G重500N,滑轮重10N,当物体G匀速上升时,挂钩B承受的拉力为______N,挂钩A承受的拉力为______N,拉力F=______N.若绳子自由端向上拉过0.5m,则物体向上移动了______m.(滑轮摩擦不计) 查看答案