Faulty operation of diesel engine fuel injection nozzles can be a direct cause of（）.
A. excessive fuel nozzle holder cooling
B. sediment in the fuel supply
C. distortion of the fuel spray pattern
D. improper atomization of the fuel
在DOS系统中，若MD命令中缺省盘符和路径，表示在（）创建子目录。
液态烃泵（），影响密封面液膜的稳定性，产生干摩擦，可导致机械密封故障，引起泄漏。
A. 发生汽蚀
B. 介质汽化
C. 密封腔内压力急剧波动
D. 平稳运行
When measuring the oxygen content of the cargo tanks prior to loading cargoes requiring vapor recovery，check it（）.
A. one meter from the tank bottom and one meter below the tank top
B. one half the ullage of the tank and one meter below the tank top
C. one half the ullage of the tank and one meter above the tank bottom
D. at three meter intervals from the tank top to the bottom
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