DC line transversal differential protection 直流线路横差保护
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Once they have come to this transversal footbridge, the choice of their direction, whether towards the platforms of line b, or towards the linking pathway to line a, is clearly before them.
人们一旦进入这个横向天桥,即面临要通往B线换乘平台或是通往A线的方向选择。
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