发布时间:2025-01-24 13:24:55
为方便计算,假设泳池的容积为两个时间的最小公倍数5*8=40,不需单位。则开上水管灌水速度为40/5=8,开排水管放水速度为40/8=5;两个开关同时打开,灌水速度快于排水速度,泳池里水增加的速度为8-5=3,则灌满所需的时间为: 40/3=13小时20分钟。
我的店面是坐南朝北门头的一面墙下大雨会有雨渗进来里面的墙会湿店面的墙是水泥墙
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