Such activities and occurrences can siphon domestic water systems, drawing every conceivable fluid connected to the user's system back into the public water supply.
这种情况和事故可能会对生活用水产生虹吸作用，将每种可能的连接用户系统的液体抽回到公用水供应系统中。
Introduces a combined heating and hot - water supply system of public bathhouse.
介绍一种公共浴室的联合供热系统。
Introduces a combined heating and hot - water supply system of public bathhouse.
介绍一种公共浴室的联合供热系统。
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