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,以减少对煤矿生产的影响。
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,以减少对煤矿生产的影响。
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