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（）.
单项选择题 A celestial body will cross the prime vertical circle when the latitude is numerically（）.
单项选择题 A casualty report of an intentional grounding of a ship is required under what condition?（）
