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 D.prevents the tow from yawing by the drag of the chains in a seaway
单项选择题 A chain bridle is preferable to a wire rope towing bridle on a long ocean tow because chain（）.
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（）.
