A.A 100 GT towboat，24 feet in length
B.A 90-foot towboat tied to the pier
C.A 60-foot towboat towing by pushing ahead
D.A 400 GT towboat anchored
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A.every towing vessel of 16 feet or over in length while navigating
B.every vessel of 50 GT and upward，carrying one or more persons for hire
C.all aircraft operating on the water
D.every power-driven vessel of 20 meters and upward while navigating
A.one and one-half times the length of a dot
B.twice the length of a dot
C.three times the length of a dot
D.four times the length of a dot
A.atmospheric noise and radiated power
B.the frequency band selected and time of day or night
C.interference and position of the moon
D.radiated power and nearness to shore
A.preferred-channel buoys
B.starboard- or port-side buoys
C.special marks
D.safe water buoys
A.You may enter fairway
B.You should enter fairway
C.ANSWER. It is permitted to enter fairway
D.You could enter fairway
最新試題
The following（）is a standard phrase.
By regulation，you MUST keep a record of the use of your radiotelephone for at least（）.
Which information must automatic identification systems (AIS) automatically provide to appropriately equipped shore stations，vessels and aircraft? （）
Which of the following statements is TRUE regarding automatic identification systems (AIS) ? （）
Automatic identification systems (AIS) are required to（）.
When should the emergency position-indicating radiobeacon be activated after abandoning a ship?（）
The unit of duration of a dash in Morse Code is（）.
Shall we（）wait at the roadstead till there is a free berth for us?
Free communication effect is in direct proportion to（）.
Which of the following statements is TRUE regarding automatic identification systems (AIS) ?（）