單項(xiàng)選擇題

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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單項(xiàng)選擇題

A celestial body’s complete orbit around another body is（）.

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

單項(xiàng)選擇題

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

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A chain bridle is preferable to a wire rope towing bridle on a long ocean tow because chain（）.

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A celestial body’s complete orbit around another body is（）.

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