A.it necessary
B.it is necessary
C.it necessary to
D.necessary
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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
A.keep silence
B.forbid transmission
C.change information
D.impose
A.taken
B.take
C.took
D.taked
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By using（）system a ship can send a distress message and know with certainty it will be received.
Radiotelephony communication or radio telex communication or both will be carried out by terrestrial or satellite means,（）the equipment fitted on ship and the area in which the incident occurs.
The vessel has stayed in port for seven days because she needs（）.
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.
What following is not among the function of SOLAS ships?（）
The frequency（）the safety message will be transmitted shall be included in DSC safety call.
For COSPAS-SARSAT system,（）usually transmit initial COSPAS-SARSAT alert.
The advantage of geostationary satellites is（）.
Every ship constructed on or after（）shall comply with all the applicable requirements of this chapter.