listed directory number display-attendant（列出目录号码显示–话务员） long line circuit（长线路用户） meet-me paging-attendant（会聚式呼叫–话务员） ..
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Protection against motor over - load usually adopt thermal relay, but protection against line over - load usually adopt long delay over- current release of circuit- breaker.
电动机过载保护通常采用继电器，而配电线路过载保护多采用断路器的长延时过电流脱扣器来完成。
The detecting circuit of power line touching of the suspension system of DC long-distance reserve power supply of PHS Cell Station was designed by the characteristic of gaseous discharge tube.
利用气体放电管的特性，实现了小灵通基站后备直流远供电源悬浮系统动力线碰触的检测；电路结构简单，实用性强。
I produced, the step-up circuit board by DuPont with the following pin connected to the main circuit plate board (Figure 6), this way you can take your own, as long as easy to produce on the line.
我公司生产，商场电路板由杜邦公司以下列销钉连接到主电路板板(图6)，这样你就可以把你自己，只要容易产生危险。
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