What is the most usual reason for the fresh water-sea water heat exchanger fouling in the
A. lube oil sludge accumulating in it
B. dirt and scale etc , formed on the surfaces
C. deformation of the tubes and the shell or the plates
D. lube oil leakage into sea-water side
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为什么价格水平的上升会使得实际GDP的需求量下降？
在寒冷地区航行轮机部必须做到： 1.对救生艇机、应急发电柴油机带动的应急救火设备，向冷却水中添加防冻剂，做好保温加热工作。 2.保持机舱或舱室的温度，关妥门窗和通风口，必要时给以加热。
在图19—6中，总需求曲线的移动可能是下面哪一项的结果？________。
A. 货币量的增加
B. 外国收入的下降
C. 税赋增加
D. 价格水平下降
E. 预期未来利润率下降
A segregated ballast system is a system where
A. all ballast is processed through the oily water separator
B. ballast is taken on and discharged through a separate main deck
C. ballast and cargo tanks are separated by cofferdams
D. all ballast lines, tanks, and pumps are independent of those used for oil
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