某飞机轮胎充气压力4.5千克/平方厘米，按气压分类，此轮胎属于（）。

DME adds to a basic VOR system another feature, namely （ ） ．

Flying from one radial to another is normally referred to as （ ） the radial.

The CDI needle of the VOR indicator shows the pilot that his aircraft is not on course when it （ ） ．

（ ） is not a necessary step to use a VOR effectively for navigation.

（ ） guided approach is non-precision approach.

The VOR signals travel on a line-of-sight basis. This means （ ） ．

Radio beams transmitted by a VOR station are called （ ） ．

（ ） is not a feature of a basic VOR system.

Which of the following is not a part of the VOR indicator?

The fuel used on piston engine aircraft is （ ）.