You should connect the hose to the tap and then turn on the water. 你應當先把軟管連接在水龍頭上然后再打開(kāi)水源。
The hose connection backflow preventer shall consist of two independently operating check valves with an intermediate atmospheric vent. 這種軟管連接防回流閥應該包括兩個(gè)獨立運行的止回閥，這些止回閥帶中間大氣排氣口。
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