單項(xiàng)選擇題

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

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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