The origin of the unit vibration in small guide vane opening is analyzed when the unit is closing and the optimal scheme of the unit closing law is suggested.

本文拟对关机过程中导叶小开度振动原因进行分析，并对机组关闭规律的优化方案及实施过程进行介绍。

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The control unit (4) controls the flow (11) of material by opening and closing solenoid valve (6).

控制单元 （4）通过打开和关闭电磁阀（6）来控制物料流（11）。

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Relay box is an operational device to tripping and closing of breaker instructed by protection, breaker controlling unit, monitor unit, and auxiliary device of breaker.

操作箱的作用是用来完成保护、断控单元、测控单元、断路器辅助装置对断路器跳合闸操作的装置。

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An independent report recommended closing the unit and transferring all services to a hospital in Middlesbrough.

BBC: North Yorkshire and York NHS Trust faces ?10m budget cuts

They have stopped inefficient unit growth, even closing stores, and are investing to improve distribution, IT capabilities, and their factory outlet system.

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Managers there, who lost a legal challenge to keep the unit open, had claimed closing it could put the entire hospital at risk.

BBC: The Royal Brompton Hospital