1. [单选题]水的导热速度很快，通常比空气导热快：
A. 6倍
B. 16倍
C. 26倍
2. [单选题]Injectors for use with heavy fuel oil must be cooled by either water or light oil to_____.
A. prevent heat corrosion to internal components
B. increase fuel delivery rate and economy
C. prevent pre-ignition
D. avoid carbonization of the nozzle tips
3. [单选题]对用于特定液货的加热介质应经()认可。应对加热盘管或导管的表面温度给予考虑，以避免货物局部过热或过冷而引起危险反应。
A. 当地海事局
B. 主管机关(competent authorities)
C. PSC
