You run the following commands： RMAN> list expired backup； RMAN> delete expired backup； What will happen to the backup set pieces associated with the backups that appear in the list expired backup command？（）
A. They will be renamed.
B. Nothing will happen to them. The backup set pieces do not exist.
C. They will be deleted immediately since they are not in the flash recovery area.
D. You will need to manually remove the physical files listed in the output of the commands.
E. They will become hidden files and removed 10 days later.
管制单位在确认某航空器丧失ADS报告能力后，应（）。
A. 通知该航空器使用话音进行位置报告，在通信盲区，使用雷达监视航空器
B. 通知航空器使用CPLDC或话音进行位置报告，并将其转换成模拟位置信号
C. 先关闭ADS功能，使用危急/紧急模式ADS报告
D. 通知航空器驾驶员关闭ADS，使用卫星电话和航空器建立话音连通
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