单项选择题
The exhaust boilers are used to recover some of （） carried in the exhaust gas from the main engine.
A.water
B.oil
C.heat
D.steam
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相关考题
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单项选择题
Impurities from the boiler water surface can be removed through the （）.
A.safety valve
B.blow down valve
C.scum valve
D.feed check valve -
单项选择题
All bilge suction must be fitted with suitable （）, which in the machinery space would be mud boxes positioned at floor-plate level for easy access.
A.strainers
B.valves
C.elements
D.separators -
单项选择题
Centrifugal pumps, however, can be designed with a number of impellers （） to attain a large amount of liquid.
A.in series
B.in parallel
C.assembled
D.together
