... 外部程式馆物件 external library object 外部线路 external line 外部链接 external link，EL ...
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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.
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