A.the range of antenna can cover everywhere in the world
B.we can know the ship’s exact position
C.that the distress alert can be located as soon as possible
D.antenna of permanent earth stations may be directed towards fixed points in the sky
您可能感興趣的試卷
你可能感興趣的試題
A.which
B.on which
C.at which
D.in which
A.it necessary
B.it is necessary
C.it necessary to
D.necessary
A.depend on
B.depending on
C.dependent on
D.depended on
A.exchange
B.to exchange
C.exchanging
D.exchanged
A.adherence to
B.adoption to
C.relaying on
D.usage of
最新試題
We consider（）send a helicopter with medical facilities to the distress area.
Radio beacon can be activated（）in case of distress.
Every lifeboat which is fitted with a fixed two-way（）radiotelephone apparatus with an antenna which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in its operating position.
（）by an ice-breaker, it is important to maintain a continuous listening watch on the appropriate VHF channel and to maintain a proper look-out for sound and visual signals.
The advantage of geostationary satellites is（）.
At least two two-way VHF radiotelephone apparatus shall be provided on every cargo ship of（）tons gross tonnage and upwards but less than 500 tons gross tonnage.
The vessel has stayed in port for seven days because she needs（）.
COSPAS-SARSAT is intended to be used for（）.
Every ship constructed on or after（）shall comply with all the applicable requirements of this chapter.
The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.