單項選擇題A METHOD OF TOWING VESSELS THROUGH POLAR ICE BY MEANS OF ICEBREAKING TUGS WITH A SPECIAL STERN NOTCH SUITED TO RECEIVE AND HOLD THE BOW OF THE VESSEL TO BE TOWED defines（）.

A.Towing operations
B.Rigid coupled towing
C.Close coupled towing
D.Hard coupled towing


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1.單項選擇題A MARK OR POSITION AT WHICH A VESSEL IS REQUIRED TO REPORT TO ESTABLISH ITS POSITION defines（）.

A.VTS point
B.Way point
C.Reference point
D.Establishment point

2.單項選擇題（）will the discharging operations take?

A.How long
B.How length
C.How many times
D.How many shift

3.單項選擇題（）will reduce the visibility.

A.dust
B.sea water
C.land sand
D.wind

4.單項選擇題（）view of the fact，I wish to submit this report.

A.In
B.On
C.To
D.For

5.單項選擇題（）using the derrick at once，the gooseneck is bent.

A.Continue
B.Start
C.Commence
D.Stop