Sorry, (say again) the force needed by bike is smaller than that of bus, BUT...
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送交者: hopelessless 于 2016-04-29, 16:35:10:
回答: 汽车和BIKE使用的力小, 并不等于人用的力小 由 hopelessless 于 2016-04-29, 16:30:46:
people need to put more force on bike than on bus, right?
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