單項(xiàng)選擇題

The function of synchronous compensating machine is to（）

A.improve power factor
B.reduce voltage oscillation
C.increase the insulation of circuits
D.eliminate regenerated magnetic fields

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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

單項(xiàng)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