单项选择题

With reference to a two ram actuating mechanism, which one of the following statement is false?（）

A.The rams work inside cylinders
B.The cylinders have glands sealing their open ends
C.The rams are connected to a cross-head
D.The cross-head is mounted on the rudder stock

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The DC excitation to the field of brushless synchronous is generally produced by （）

A.an exciter driven by the same shaft with the generator
B.an exciter driven by external prime mover
C.generator itself
D.either A and B

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Which of the following equipment is not pollution prevention equipment?（）

A.oily water separator
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D.incinerator

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The initial voltage of self-excitation generator set up by（）

A.residual magnetism
B.voltage regulator
C.electrical current for excitation
D.the other running generator