The composition, major function, operating principle and design idea of SF6 environment monitoring system for high-tension switch house were introduced.

介绍了高压开关配电室SF 6环境监测系统的组成、主要功能、工作原理及设计思想。

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How -- substantively, how significant is this switch to the White House?

WHITEHOUSE: Press Briefing

Lighthouse authority Trinity House plans to switch off Godrevy light on the edge of St Ives Bay by 2010.

BBC: NEWS | UK | England | Cornwall | Lighthouse switch-off considered

But Nokia stuck with Symbian OS, adding in new elements such as touch screen operation and (slightly) improved media handling, rather than make a switch to one of their in-house alternatives that were under development.

FORBES: A Single Misstep With Symbian Eviscerated Nokia - Will Samsung Suffer A Similar Fate?