如图1是一种利用杠杆原理制成的供搬运重物上楼用的爬楼车oo′两处为轴连接.请你根据爬楼车的使用过程分析说明爬楼车是费力杠杆还是省力杠杆 Template




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tomski如图1是一种利用杠杆原理制成的供搬运重物上楼用的爬楼车oo′两处为轴连接.请你根据爬楼车的使用过程分析说明爬楼车是费力杠杆还是省力杠杆 coloring