单相结线牵引变压器
single phase traction transformer
电力牵引用内包式钢铝接触线
inner cladding type of St-Al contact wires for electric traction
腹壁牵引线
Abdomen wall traction stitch
牵引力自动电子加力线路图
automatic electronic traction aid wiring diagram
三相结线牵引变压器
three phase traction transformer
three phasetraction transformer