[音频]Air Force 1：Norcal Approach, good afternoon, Air Force 1 is _________information ____, request the ______RNO GND：American 1218 runway 16R taxi via A, ______AAL1218: A To 16R without delay, American 1218Norcal Approach: ...the localizer descend at pilot’s _______, maintain_____Air Force 1:_____________________Air Force 1

There is a delicate balance of nature ______ many square miles of ocean and vegetation and clean air are needed to maintain only a relatively few human beings. A: where B: in which C: when D: how

There’s a feeling of unrest nowadays. A: in the air B: on the air C: by air D: in air

4. From the control tower, air traffic controllers coordinate aircraft movement both ________ and on the ground. A: on the air B: in the air C: at the air D: of the air

智慧职教: Compressed air is supplied by air compressors to air receivers.

MAINTAIN: Can they maintain it A: keep it as it is B: make it large C: get a better one than it D: get it

Western people regard rationality as an indispensable element and in believe that they must maintain the ______ system to maintain the social normal order. A:

The function of lubricating oil is to( ) A: maintain even distribution of bearing wear B: maintain a constant oil temperature C: maintain a pressurized fluid film between moving surfaces D: remove entrained water

An air waybill is used for air transport. It is an evidence of a ( ).

The air leakage of tubular air preheater is larger than that of rotary air preheater (). A: Right B: Wrong