单项选择题
In order to maintain a constant outlet water temperature of 80-85℃ from the engine, a three-way valve is installed（）
A.at the jacket cooler outlet to control the flux through the engine
B.at the jacket cooler outlet to control the flux through the cooler
C.at the engine outlet to control the flux through the engine
D.at the engine inlet to control the flux through the engine
相关考题
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单项选择题
About the jacket water, that of the auxiliary engines usually（） is circulated by pumps, and the main engine usually （）
A.an engine-driven；as well
B.an engine-driven；has an independent pump
C.an independent；as well
D.an independent；has an engine-driven pump -
单项选择题
The cooling system（） needs least maintenance work for in this kind of system（）
A.open；the minimum components
B.open；the high cooling efficiency
C.central；there are more coolers and a extra set of pumps
D.central；there is only one component contacts seawater -
单项选择题
An alarm device inserted between the deaerating tank and the expansion tank can notify the on-watching crew that （）
A.the expansion tank is lack of water
B.the expansion tank is over flowing
C.there is something wrong with the cooling system
D.there is something wrong with the engine
