A.inspecting
B.inspected
C.inspects
D.having inspected
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A.coming into effect
B.moving to full effect
C.being based on force
D.coming into force
A.fixed
B.matched
C.fitted
D.equal
A.square
B.triangle
C.circle
D.rectangle
A.cannot
B.are not allowed
C.have the right
D.should get permission to
A.every two years
B.every three years
C.every year
D.every four years
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By using（）system a ship can send a distress message and know with certainty it will be received.
As each MSI message will have a unique identity, the printing of messages already received correctly is（）.
Radio communication（）for many years and helps to save tens of thousands of lives.
Before GMDSS, if the radio officer on board is serious ill,（）.
SOLAS ships shall be equipped with（）.
The vessel has stayed in port for seven days because she needs（）.
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.
COSPAS-SARSAT is intended to be used for（）.
The rescue coordination center may（）on stations which interfere with traffic.
Every ship constructed on or after（）shall comply with all the applicable requirements of this chapter.