A chain bridle is used when towing astern because it（）.

单项选择题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

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

单项选择题A buoy with a composite group-flashing light indicates a(n)（）.

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