A.persist
B.persists
C.to persist
D.persisted
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A.pay out
B.make fast
C.shorten
D.hold on
A.calls
B.called
C.calling
D.call
A.telephone
B.telegraph
C.telex
D.VHF
A.calls at
B.has called at
C.call at
D.will call at
A.Calling frequency
B.Distress frequency
C.Urgency frequency
D.Working frequency
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The height of a VHF radio antenna is more important than the power output wattage of the radio because（）.
（），the cargo plan is not well done.
My ship（）that port next month.
（）both anchors.
You are making a telephone call ship-to-shore using the VHF-FM service.You can tell that the working channel is busy if you hear（）.
The expression STAND-BY ENGINE means:（）.
The control of distress traffic is the responsibility of（）.
Vessels wishing to communicate with the Port Health Officer should do（）on VHF Channel 14.
The space in Hatch No.4 tweendeck is too（）.
A call between any two ship stations on an intership working frequency shall have a maximum duration of（）.