【判断题】实验实训前 ,必须认真预习有关实验指导书和教材,理解实验目的、原理和方法,了解实训操作规程等,未经预习,不得进入实验室。
【单选题】Having checked the doors were closed, and ___ all the lights were off, the boy opened the door to his bedroom.
【单选题】Having checked the doors were closed and ______ all the lights were off, the boy opened the door to his bedroom.
【单选题】静压轴承的工作原理是 ,再经过间隙流回油池。
【判断题】最重要的用户界面要素是软件符合现行标准和规范。
【简答题】Having checked the doors were closed, and ___ all the lights were off, the boy opened the door to his bedroom. A.why B.that C.when D.ours1