1. [单选题]There is ________ Ocean-going Vessel in the harbor.
A. a
B. the
C. an
D. about
2. [单选题]对货物状态控制说到底就是保证货物的()受到控制。
A. 状态
B. 质量
C. 稳定
3. [单选题]航行于国际航线上的船舶，船上船钟所采用的时间一般为：()
A. 世界时
B. 当地平时
C. 所在区时
D. 北京时间
4. [单选题]Which of the following is NOT mentioned in this passage?
A. There may be oil vapor in the engine room
B. Pipes and fittings may be damaged if explosion takes place
C. The cooler should be drained
D. Bursting caps must be fitted
5. [单选题]Which statement is NOT true?
A. While displacement pump works, volume of the working chamber will increase and decrease alternately
B. A gear pump always has two gears
C. Any vane pump will have a rotor within a ring
D. A balanced vane pump has two outlet ports and they are positioned symmetrically
