试论确定行政主体概念的意义。
铁路机车车辆驾驶证中,()驾驶证准驾动车组和电力机车。 ["J1类","J2类","J3类"]
I wish that he()to the movies with me yesterday. ["went","could go","was gone","could have gone"]
申请J1、J2或J3类驾驶证时,年龄不超过45岁,应当担任机车司机职务()以上且安全乘务10万公里以上,并经动车组驾驶适应性测试合格。 ["1年","2年","3年"]
光保护切换盘常用光口连接器的类型有()。 ["FC","SC","LC","MU"]
简述哈拉帕文化的成就?