Power centralized freight trains are characterized by ___________________pulling as many as at least 50 different types of freight vehicles with a certain range of weight limit. 动力集中货运列车的特点是______________牵引至少50节的不同类型、有一定重量限制范围的货物车辆。
A、large voltage electric locomotive大功率电力机车
B、high voltage electric locomotive 高功率电力机车
C、electric locomotive电力机车