单项选择题
When may the automatic identification system (AIS) be switched off? （）
A.At anytime as long as it is properly logged
B.At the Master's professional judgment
C.Only when the vessel is at anchor or in port
D.Under no circumstance
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When communicating on the radiotelephone using plain English，what procedure word indicates the end of my transmission and that a response is necessary? （）
A.Out
B.Over
C.Roger
D.Wilco -
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To reduce the amount of catenary you may（）.
A.shorten the hawser or increase the tug's speed
B.lengthen the hawser or reduce the tug's speed
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The Vessel Bridge-to-Bridge Radiotelephone Act applies to which towboat?（）
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
