... open end wrench group；开口扳手组件 open exhaust valve；打开排气阀 open field circuit；开式励磁回路 ...
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打开排气阀，直到水流清澈没有气泡。
Open the purge valve until the water flows clear and free of bubbles.
汽轮机驱动器通过缓慢打开排气阀加热。
The steam turbine drivers are warmed by slowly opening the exhaust valves.
如果排气系统处于真空下，必须在打开排气阀后，逐渐引蒸汽来加热壳体。
If the exhaust system is under a vacuum, the casing must be warmed by gradually introducing the steam, after opening the exhaust valve.
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