CRH380AL型动车组真空断路器的作用是是为了当牵引变压器在二次侧以后的电路中发生故障时，迅速、安全、确实地（）。
参考答案：断开过电流
No sooner ______ on board the train than it______ to move.
A．did he go; had started
B．he went; started
C．had he gone; started
D．he had gone; had started
带式焙烧机和链篦机的区别？
