单项选择题
A chart position enclosed by a square is a(n)（）.
A.fix
B.estimated position
C.dead reckoning position
D.running fix
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A change of a documented vessel’s name can only be made by the（）.
A.American Bureau of Shipping
B.Commissioner of Customs
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单项选择题
A chain bridle is used when towing astern because it（）.
A.is easy to connect
B.provides an effective catenary and absorbs shock due to its weight
C.makes rigging a swivel unnecessary
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A chain bridle is preferable to a wire rope towing bridle on a long ocean tow because chain（）.
A.is more flexible and has the ability to absorb shock because of its weight
B.is less subject to wear and damage from abrasion
C.requires little maintenance
D.All of the above
