蓄水池装有甲丙两根进水管和乙丁两根排水管要注满一池水单开甲管需要3小时单开丙管需要5小时要排完一池水单开乙管需要4小时单开丁管 Template




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tomski蓄水池装有甲丙两根进水管和乙丁两根排水管要注满一池水单开甲管需要3小时单开丙管需要5小时要排完一池水单开乙管需要4小时单开丁管 coloring