For maintenance convenience,many electric switches for mine are adopted pinboard construction in order to reduce effect of coal mine production.

为了维修方便,许多矿用电气开关采用插接式结构,以减少对煤矿生产的影响。

Excavate coal is primary production link in coal mine production, therefor, Weaving excavate coal working face supersedure plan has instructional meaning.

采煤是煤矿生产中的主要生产环节,因而编制采煤工作面接替计划对煤矿生产具有指导性意义。