單項選擇題

What is head tank in the closed cooling water system used for?（）

A.for the release of air from the cooling water
B.providing expansion room for heated cooling water
C.a place for implementing water and water treatment agent
D.all of the above

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單項選擇題

According to the principle of four stroke diesel engine, what is the number of its efficient work stroke per revolution?（）

A.1/2
B.1
C.2
D.3

單項選擇題

What type of electric motor is most commonly used on board ship?（）

A.non-synchronous electric motor
B.synchronous electric motor
C.fully enclosed electric motor
D.watertight electric motor

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What is head tank in the closed cooling water system used for?（）

你可能感興趣的試題

According to the principle of four stroke diesel engine, what is the number of its efficient work stroke per revolution?（）

What type of electric motor is most commonly used on board ship?（）