單項選擇題The frequency 156.525MHZ and 156.8MHZ should be used in the band of().

A.MF
B.VHF
C.HF
D.LF


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3.單項選擇題()communication are intership VHF radio telephone communication.

A.ship-to-shore
B.shore-to –ship
C.bridge-to-bridge

4.單項選擇題From IMO’S point of view, INMARSAT’s most important function is the provision of().

A.general radio communication
B.MSI
C.improved distress and safety communication
D.bridge-to-bridge communication