光保护切换盘常用光口连接器的类型有()。 ["FC","SC","LC","MU"]
试论行政行为的合法要件。
铁路机车车辆驾驶证中,J2类驾驶证准驾()。 ["动车组和内燃机车","动车组和内燃、电力机车","动车组和电力机车"]
列车调度员根据司机(动车组列车为随车机械师通过司机提出的)下车检查或登顶作业的请求,发布邻线列车限速()km/h及以下调度命令。 ["80","160","120"]
Your hair needed()I am glad you had it cut. ["cut","cutting","to cut","being cut"]
简述大化改革的历史背景和内容?