单项选择题
A.Immediately B.After one hour C.Only when another vessel is in sight D.Only after sunset
When may the automatic identification system (AIS) be s...
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
When communicating on the radiotelephone using plain En...
单项选择题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
To reduce the amount of catenary you may（）.A.shorten th...
单项选择题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
