When the controller asks the pilot to “stand by”, he means _________.
A.he knows the pilot called
B.he will get back to the pilot as soon as possible
C.the controller may be talking to someone else on a different frequency
D.al1 of the above
正确答案是D
When the controller asks the pilot to “stand by”, he means _________.
A.he knows the pilot called
B.he will get back to the pilot as soon as possible
C.the controller may be talking to someone else on a different frequency
D.al1 of the above
正确答案是D