單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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
C.place your tug in irons
D.make a sharp turn