In selecting a tug for moving a vessel，consideration should be given to its（）.
A. indicated horsepower，bollard pull，and displacement
B. indicated horsepower，maneuverability，and displacement
C. indicated horsepower，bollard pull，and maneuverability
D. bollard pull，displacement，and maneuverability
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围棋博大精深，具有十分丰富的象征意义，请试举几点加以说明。
What is the function of an air receiver in the compressed air system on a ship? （）
A. Condenses moisture
B. Provides overpressure protection
C. Purifies the air
D. Acts as an accumulator
什么是城市规模与城市规模经济？城市规模经济表现在哪些方面？
由正线与侧线组成的交叉线岔，正线接触线位于侧线接触线的上方。
A. 正确
B. 错误
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