马拉车时马只施力不受力，车只受力不施力，所以马才能把车拉动。[ ]
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John wanted to ride his bike in the street but his uncle told him _____ .
A. not to B. not do B. not do it D. do not to
宫颈癌根治术后可以拔除尿管的时间是术后
A．1～2天B．7～14天C．3～4天D．5～6天E．2周以后
