A.平行于B.垂直于C.有時平行有時垂直
A.單邊和雙邊供電B.單邊和越區(qū)供電C.雙邊和越區(qū)供電D.越區(qū)供電
A.柔性架空式接觸網(wǎng)B.剛性架空式接觸網(wǎng)C.接觸軌式接觸網(wǎng)D.跨座式單軌接觸網(wǎng)
