发布时间:2025-01-24 13:36:53
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。
我刚买的楼房,水暖工说卫生间的水泥地要全部砸掉,重新做防水,请问他说的对吗
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