This system fire prevention broadcast part is the main line system, realizes the background music and the urgent broadcast by the broadcast cut module cuts.

本系统消防广播部分为总线制，由广播切换模块实现背景音乐与紧急广播切换。

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The main valve and pilot system can be serviced without removing the valve from the line.

不需要从管线上拆卸阀门，就可以对主阀和引导系统进行维修。

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This paper introduces a familiar kind of computer control system for convolute product line, and discusses its composition, main function and implementation method.

本文介绍了一种常见的卷绕生产线计算机控制系统，阐述了系统的构成、主要功能和实现方法。

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The line between Hinkley and Avonmouth would need to fit into the main national system where power goes in both directions, the NG said.

BBC: National Grid urged to use underground cables in Somerset