单选题
发布日期:2021-03-22
the speed of the alternators
the field strength of the machines
the power factor of the alternators
steam supply to the prime movers
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马场有甲、乙、丙、丁四个口可以提供人进入游玩,如果现在开了甲、乙两个口,经过了4.5小时游客全部能够进入,如果开乙、丙两个口,游客3小时能全部进入,如果开丙、丁两个口,游客3.5小时全部进入。若只打开甲、丁两个口,则需要几个小时,游客能全部进入?( )
法定代理人可因被代理人取消委托而丧失代理权。
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