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,许多矿电气开插接式结构,以减少对煤矿产的影响。
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,许多矿电气开插接式结构,以减少对煤矿产的影响。
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