在机场控制区内教练车辆驾驶。
参考答案:错
-Why didn’t you go to the cinema with us this afternoon, Jim?
-Because I ______ at the station for my uncle from Beijing at that time.
A.was waiting
B.have waited
C.am waiting
D.will wait
自动曝光探测器应安装在
A.控制台内B.X线管窗口处C.胶片暗盒下面D.肢体和滤线栅之间E.滤线栅和暗盒之间