发布时间:2025-01-31 21:48:20
实际上,进水管需要进水8升,然后排水管才能开始工作,时间为8/12=2/3小时,之后,泳池每小时可以剩余12-8=4升,
50升=0.05立方米,
50000升 =50立方米
50000/4=12500小时
基本肯定老师的脑袋进水了
老红双喜08 乒乓球拍 材质:椴木 7层 横版 这样材质的底板拍 需要多少钱
2025-01-31 21:48:20 2025-01-31 21:48:20 2025-01-31 21:48:20 2025-01-31 21:48:20revell威望提尔皮茨号战列舰铂金版模型revell威望提尔皮茨号战列舰 铂金版 1350
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