what types of buildings is it installed?, what isn’t required?, to minimise noise transmission, how much insulation is needed?, what is it previously known as?, what materials is it made from?, what is needed on the vent pipe on the roof?, what is caused by backed up stagnant water?, why don’t we use a 90 degree bend on a toilet?.

primary ventaliation stack systems

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排行榜

隨機卡是一個開放式範本。它不會為排行榜生成分數。

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恢復自動保存: ?