用DSC呼叫建立船岸间常规电话通信链路，随后的通信工作频率（道）由（）决定.

A.船台

B.岸台

C.船岸台均可

D.用户

The height of a VHF radio antenna is more important than the power output wattage of the radio because（）.

A.VHF communications are basically line of sight

B.the air is more dense the higher you go

C.salt water is a poor conductor of sound

D.sea water absorbs the radiated energy