电气部分用开关信号通过PLC来控制电磁阀，并运用外部线路来达到自动输送计量的目的。
In the end we control the electromagnetism valve by switching signal with using PLC and achieve the intention that we can use the exterior circuitry to automatically transport in electricity.
一种配线框架，在水平面上装有所有外部线路，在垂直面上装有中心局设备的端线及它们的保护装置。
A distributing frame carrying on one side all outside lines, and on the other side the terminations of the central office equipment and protective devices for them.
只有一个外部晶体管所需的变容二极管，线路驱动。
Only one external transistor is required for varactor-line driving.
数字式变压器差动保护在星形侧发生外部单相接地或线路单相遭雷击的情况下，差动保护有时会误动。
Digital transformer differential protection may falsely take effective when external single-phase earth fault occurs at star side or the line endures lightning strike on single phase.
论述了目前电气化铁道计算机继电保护系统在运行中如何利用计算机对其外部二次线路进行监控的问题，能提高计算机继电保护智能化的程度。
The computer protection system in the electrified railway can use computers to supervise and control its external secondary wiring, which improves the intelligence of computer protection.
旅游线路开发中存在着外部经济问题，旅游线路专营是对这一问题的一种尝试性解答；
There are the problems of external economies in the development of tourism route. Tourism route monopoly is a try to resolve the above problems.
换句话说，人脑不是不变的线路，它可以调整自己来更好地为机体服务，适应内外部的环境。
In other words, the brain is not immutably "hardwired," and it may reorganize itself to better serve the organism and adapt to its changing internal and external environments.
在电动机运行前，该保护系统对外部保护线路、PLC内部程序及PLC自身进行检查。
Before the operation of the motor, the system detects the external protective circuit, PLC and its internal program.
在电动机运行前，该保护系统对外部保护线路、PLC内部程序及PLC自身进行检查。
Before the operation of the motor, the system detects the external protective circuit, PLC and its internal program.
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