单项选择题

Please separate these bags and put them on the（），which will take them to be screened by X-ray equipment.

A.plate
B.tray
C.table
D.belt

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单项选择题

（）refers to the freight carried by an aircraft.

A.air mail
B.air carrier
C.air bus
D.air cargo

单项选择题

在无仪器或仪器设备发生故障时，应当对旅客及其行李物品进行（）检查。

A.观测
B.手工
C.监控
D.抽查