單項選擇題

In modern installations, the main engine and the standby auxiliary engines（）

A.can be started at low temperature and are free from preheating
B.usually are preheated by steam before being started
C.are kept at a constant temperature and free from preheating
D.are kept at a low temperature to save energy

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單項選擇題

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

單項選擇題

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

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In modern installations, the main engine and the standby auxiliary engines（）

你可能感興趣的試題

In order to maintain a constant outlet water temperature of 80-85℃ from the engine, a three-way valve is installed（）

About the jacket water, that of the auxiliary engines usually（） is circulated by pumps, and the main engine usually （）

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