仪表进近的起始进近航段中主要采用（）四种程序。

Code 7500 alerts ATC that （ ） ．

When an error is made a transmission, “（ ）” shall be spoken, the last correct group or phrase repeated and then the correct version transmitted．

Which of the following is not a correct procedure?

That aircraft fly wrong routes or change routes without authorization is （ ） ．

If, at any time, the pilot is given an instruction that is beyond his airplane＇s capabilities or is not safe to follow, which of the following practices is not right?

When establishing communications, （ ） ．

A radio that combines a transmitter and receiver in one unit is called a （ ） ．

Which statement below is not true?

The identification markings of civil aircraft include （ ） ．

The phrase “go ahead” means “（ ）”．