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
单项选择题The Vessel Bridge-to-Bridge Radiotelephone Act applies to().
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
单项选择题The unit of duration of a dash in Morse Code is().
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
单项选择题The range of a SSB transmission is MOST affected by().
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
单项选择题The light rhythm of Morse (A) is shown on().
A.preferred-channel buoys B.starboard- or port-side buoys C.special marks D.safe water buoys
单项选择题The following()is a standard phrase.
A.You may enter fairway B.You should enter fairway C.ANSWER. It is permitted to enter fairway D.You could enter fairway