57、X射线机操作员应在了解X射线机( )定义的基础上,掌握X射线机是否符合标准值的要求,以此判断X射线机是否处于( )工作状态。

6、Baggage that is carried in the baggage compartment is usually called( ).

5、If space is not available on the flight that the passenger desires, it is advisable that the agent be able to suggest( ).

7、( ) operates on the schedule whether there are five passengers on board or a full load of two hundred passengers.

6、( ) connect smaller cities and towns with each other or with the major centers or the major airports.

7、A place which is set for the end of a journey is called( ).

6、( )are those which operate between major population centers.

7、The baggage allowance for First Class is( ).

6、The flight from China to America is called a( ).

7、A( ) leaves at the same time on the same day to the same destination.

6、The flight from Shanghai to Beijing is called a( ).