單項(xiàng)選擇題

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

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

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單項(xiàng)選擇題

A SART can be fixed on（）.

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

單項(xiàng)選擇題

All stations which receive a distress alert shall immediately cease（）.

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