所有的航空器的燃油箱必须通气的目的在于（）。

An on glide slope indication from a tri-color VASI is （ ） light.

An above glide slope indication from a tri-color VASI is （ ） light.

A below glide slope indication from a tri-color VASI is （ ） light.

An on glide slope indication from a two-bar VASI is （ ） ．

Which is true regarding STARs?

An above glide slope indication from a two-bar VASI is （ ） ．

A below glide slope indication from a two-bar VASI is （ ） ．

The color of anti-collision light on the aircraft is （ ）.

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 （ ） ．