在汽化式、压力喷射式和直接喷射式三种燃料系统中，（1）三种燃料系统都是连续喷油的；（2）直接喷射式是间断喷油的，汽化器式和压力喷射式是连续喷射的，其中（）。

The most complex approach lighting systems are designed for runways with （ ） ．

Airport lighting system should be opened twenty minutes before the aircraft is expected to （ ） ．

Large “Xs” on taxiways indicate that （ ） ．

Large “Xs” painted on runways indicate that （ ） ．

The area preceding a displaced threshold cannot be used for （ ） ．

Which statement below is not true?

If a displaced threshold marking is seen on a runway, which of the following is not true?

The （ ） section of the turbofan engine supplies compressed air to the A/C.

Which runway marking may not be seen on a non-precision runway?

Instrument approaches using the vertical guidance to the landing runway are called （ ） ．