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
Radio beacon can be activated（）in case of distress.
We consider（）send a helicopter with medical facilities to the distress area.
As each MSI message will have a unique identity, the printing of messages already received correctly is（）.
By using（）system a ship can send a distress message and know with certainty it will be received.
The advantage of geostationary satellites is（）.
The vessel has stayed in port for seven days because she needs（）.
Please use（）for（）.
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.
International Navtex service means the coordinated broadcast and automatic reception on（）khz of maritime safety information by narrow-band direct-printing telegraphy using English language.
SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.