单选题The height of a VHF radio antenna is more important than the power output wattage of the radio because（）.AVHF communications are basically line of sightBthe air is more dense the higher you goCsalt water is a poor conductor of soundDsea water absorbs the radiated energy
单选题
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
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