Lay a layer of clay on the displayed layout before the relay race.
接力赛之前在展示的陈设上铺一层黏土。
The article introduces property and installation of new motor general protector with electronic re - lay substituting for double metal plate relay.
介绍以电子式热继电器取代双金属片式热继电器的新型电动机综合保护器的性能特点以及安装接线方法。
Calculation of current coil is discussed to middle relay and signal relay, lay stress on signal relay that contents condition and selects a type in different circumstances.
介绍中间继电器和信号继电器电流线圈的计算，着重分析信号继电器所需满足的条件和在不同情况下的选型。
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