單項選擇題Before(),a station shall take precautions to ensure that its emission will not interfere with transmission already in progress.

A.transmit
B.to transmitting
C.transmitting
D.in transmitting


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2.單項選擇題Which expression has the different meaning from entry into force ? “entry into force” means is().

A.coming into effect
B.moving to full effect
C.being based on force
D.coming into force

5.單項選擇題Vessel in distress()indicate their position by any method.

A.cannot
B.are not allowed
C.have the right
D.should get permission to