Ask the switchboard operator for an outside line.

叫(电话)接线员接外线。

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This paper presents a structure of automatic switchboard of power line carrier equipment.

本文介绍了一种新的电力线载波机自动盘的结构。

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High Voltage Transmission and Distribution, City Power Supply, Line Tower, Transformer Shell, High Voltage Switchboard and link system.

高压输配电、城市供电、线路的铁塔、变压器罩壳，高压开关柜及连接系统。

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High Voltage Transmission and Distribution, City Power Supply, Line Tower, Transformer Shell, High Voltage Switchboard and link system.

高压输配电、城市供电、线路的铁塔、变压器罩壳，高压开关柜及连接系统。

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