题目内容

An ILS consists of ____ guidance (Localizer) and vertical guidance (Glideslope or Glide Path) to aircraft approaching a runway.

A. lateral
B. horizontal
C. longitudinal
D. level

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Aircraft guidance is provided by the ILS receivers in the aircraft by performing a ____ depth comparison.

A. adjustment
B. modification
C. modulation
D. rectification

A localizer (LOC) antenna array is normally ______ beyond the departure end of the runway and generally consists of several pairs of directional antennas.

A. adjusted
B. supported
C. located
D. equipped

A localizer (LOC) antenna array generally consists of several pairs of ____ antennas.

A. precision
B. directional
C. non-directional
D. non-precision

Each ILS antenna ____ a narrow beam, one slightly to the left of the runway centerline, the other to the right.

A. transmits
B. sends
C. transfers
D. delivers