单项选择题

The broadcast of MSI is made on two dedicated systems. “dedicated” means（）.

A.special
B.different
C.expensive
D.valuable

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单项选择题

A.a mother ship
B.a lifeboat
C.a life craft
D.all of A,B,C

单项选择题

A.any transmission
B.any harmful transmission
C.to use radiotelephone
D.using radiotelephone

单项选择题

A.reach the distress area
B.conduct a sector search
C.send rescue vessels
D.assist coordinately in SAR operation