【导读】
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1. [单选题]During UMS rounds, a duty engineer notices that the fuel oil overflow observation glass is full of oil. Should he ____.
A. Stop all F.O. transfers immediately, and inform the chief engineer.
B. Make a sounding of the F.O. overflow tank and decide if there is enough capacity to leave it until the following morning.
C. Call a motorman and have him sound the F.O. overflow tank periodically during the night.
D. start the F.O. purifier
2. [单选题]液压节流阀应尽可能选用薄壁型节流口，是因其流量基本不随一的变化而变化，
A. 小孔截面积
B. 黏度
C. 温度
D. B+C
3. [单选题]在加热系统中，除()外，在其他任何情况下，应有设施来保证在管系中保持比舱内货物作用于管系的最大压力还要高的压力。
A. 压载舱
B. 空舱
C. 特殊舱室
