单选题:一个水池有两个排水管甲和乙,一个进水管丙。若同时开放甲、丙两管,20小时可将满池水排空;若同时开放乙、丙两水管,30小时 题目分类:行政能力 题目类型:单选题 查看权限:VIP 题目内容: 一个水池有两个排水管甲和乙,一个进水管丙。若同时开放甲、丙两管,20小时可将满池水排空;若同时开放乙、丙两水管,30小时可将满池水排空;若单独开丙管,60小时可将空池注满。若同时打开甲、乙、丙三水管,要排空水池中的满池水,需多少小时?( ) A.7 B.8 C.9 D.10 参考答案: 答案解析:
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According to the writer, the liability associated with the According to the writer, the liability associated with the service means thatA. 分类:行政能力 题型:单选题 查看答案