相关题目
ATC is a service used for the purpose of anti-collisions between aircraft; anti-collisions between aircraft and （ ） on maneuvering area, and expediting and maintaining an orderly flow of air traffic.
The most probable cause of a spark is from （ ） that discharges between refueling equipment and the airplane.
The major refueling hazard is the possible （ ） of the fuel by a spark that causes fumes to ignite.
An electric （ ） provides fuel under pressure for engine starting and as a backup, should the engine e-driven pump malfunction.
The （ ） system works well in high wing airplanes where the fuel tanks may be positioned above the engine and the difference in height between the wing-mounted fuel tanks and the engine allows the fuel to flow under sufficient pressure to the engine.
The （ ） system is usually found in low-wing airplanes, where the fuel tanks may be located below the engine.
The gravity-feed fuel system does not include （ ） ．
There are two general types of fuel systems, which are （ ） systems.
（ ） is considered a back-up source of heading information.
When properly set, （ ） is the primary source of heading information.
