一位涡轮飞机的飞行员在配备VASI的跑道上进近着陆时应该怎样?
参考答案:保持在或高于下滑道的高度上直到达到一个能安全落地的较低高度。
The workers were made _____ the whole day. [ ]
A. work
B. to work
C. worked
D. working
引起人类原发性非典型肺炎的病原体是()
A.肺炎链球菌
B.肺炎支原体
C.莫氏立克次体
D.普氏立克次体
E.解脲脲原体