Simple, compact structure, quick 90 degree on-off operation.

结构简单、紧凑， 阀体90度回转启闭迅速。

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The paper summarizes research actuality of on-off operation of small refrigeration system, and explains and analyzes the whole on-off process and its influence.

本文综述了小型制冷系统启停过程的研究现状，详细说明和分析了制冷系统整个启停过程及由此造成的影响。

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Installed in a mainline it prevents upstream pressure from dropping below a preset minimum. Solenoid override of the sustaining function allows for electrical on-off operation.

安装在主管线内，防止上游压力降到预置最小压力以下。电磁阀的过载平衡功能使其能够进行电气开-关操作。

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Joy at last week's 2-1 victory over Chelsea was dampened by dismay over the tea-time kick-off and the pre-match news that midfielder Marouane Fellaini requires an operation on his injured ankle and will be out for six months.

BBC: Everton 2-1 Sporting Lisbon

There are also guidelines requiring one-handed operation and a two second limit on "off-road glances" - the time spent looking at the device.

BBC: Hi-tech cars: Driver distraction warning in US

The weapons were found aboard a vessel intercepted off Yemen's coast on 23 January in an operation co-ordinated with the US Navy.

BBC: Yemen blames Iran after weapons haul