单项选择题

A.is more flexible and has the ability to absorb shock ……

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

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单项选择题A celestial body’s complete orbit around another body is（）.

A.a rotation
B.a revolution
C.space motion
D.nutation

单项选择题A celestial body will cross the prime vertical circle when the latitude is numerically（）.

A.greater than the declination and both are of the same name
B.less than the declination and both are of the same name
C.greater than the declination and both are of contrary name
D.less than the declination and both are of contrary name

单项选择题A casualty report of an intentional grounding of a ship is required under what condition?（）

A.Under any condition
B.If the grounding lasts over 24 hours
C.If it creates a hazard to the environment
D.At the owner's discretion

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A.bifurcation
B.fish net area
C.anchorage area
D.dredging area

单项选择题A block and tackle is “rove to advantage”. This means that the（）.

A.blocks have been overhauled
B.hauling parts of two tackles are attached
C.hauling part leads through the movable block
D.hauling part leads through the standing block