单项选择题
Proper GMDSS watchkeeping includes（）.
A.monitoring all required frequencies in the proper mode
B.reading all displays and/or printouts after silencing an alarm
C.notifying the Master of any distress alerts
D.All of the above
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Our ship（）with many modern navigational instruments.
A.equipped
B.is equipped
C.equips
D.has equipped -
单项选择题
One method of reducing the length of radio transmissions without distorting the meaning of your words is by using（）.
A.slang
B.secret codes
C.procedure words
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单项选择题
On which vessels is GMDSS required? （）
A.All vessels capable of international voyages
B.Vessels operating outside of the range of VHF coastal radio stations
C.SOLAS Convention ships of 300 gross tonnage or more
D.Coastal vessels of less than 300 gross tons
