一水池有甲乙两个进水管,若单独开甲、乙管各需要a小时,b小时可注满空池;现两管同 发布时间:2017-05-16 15:52 │ 来源:www.tikuol.com 题型:选择题 问题: 一水池有甲乙两个进水管,若单独开甲、乙管各需要a小时,b小时可注满空池;现两管同时打开,那么注满空池的时间是( )A.1a+1bB.1abC.1a+bD.aba+b
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