单项选择题
What does the abbreviation VHF stand for?（）
A.Vessel's Hoisting Flag B.Very High Safety C.Vessel's Homing Frequency D.Very High Frequency
单项选择题 Vessels wishing to communicate with the Port Health Officer should do（）on VHF Channel 14.
单项选择题 There is a VHF set（）the front of the wheelhouse.
单项选择题 There is a drifting mine（）in position 21 degrees 31 minutes North 124 degrees 20 minutes East.
