A.two
B.three
C.more than two
D.more than three
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A.as many as three
B.more than two
C.less than two
D.up to four
A.3
B.4
C.8
D.12
A.besides the polar regions
B.including the North Pole and the South Pole
C.above 70°N and below 70°S
D.as for north and south as 70°
A.be transmitted at once though the frequency is not clear
B.be transmitted as soon as the frequency is cleared coordinately
C.be transmitted at its scheduled transmissions
D.be transmitted at next scheduled transmissions
A.meteorological warnings
B.navigational warnings
C.search and rescue information
D.meteorological forecast
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Radio beacon can be activated（）in case of distress.
（）will form the basis for distress alerting and safety calling.
Every lifeboat which is fitted with a fixed two-way vhf radiotelephone apparatus with（）which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in its operating position.
Can MF/HF radiotelephone receive the MSI sent from the coast stations alone?（）
As each MSI message will have a unique identity, the printing of messages already received correctly is（）.
If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.
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.
For COSPAS-SARSAT system,（）usually transmit initial COSPAS-SARSAT alert.
We consider（）send a helicopter with medical facilities to the distress area.
Monitoring is especially important in a highly automated system which is dependent on careful（）procedure and format.