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,
减少对煤矿生
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式结构,减少对煤矿生响。
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