进行干部考察工作前是否要发布考察预告？
参考答案：
必须发布考察预告。
You can't play basketball until your homework _____. [ ]
A. finishes
B. is finished
C. finished
D. is finishing
哪一部ILS接收机向GPWS提供数据?
A、ILS 2
B、ILS 1
C、ILS 1和ILS 2
D、不确定
