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The industrial used valve massive applications, will be later only then start from the watt invention steam engine.
工业用阀门的大量应用，是从瓦特发明蒸汽机以后才开始的。
I. To disconnect the fixed CO2 start up line (include in fire station) and to close CO2 discharge valve to engine room.
拆下大型固定CO2的启动瓶控制管路（包括消防站的），关闭CO2到机舱的释放阀，将CO2的门电焊焊死。
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