你可能感興趣的試題

單項選擇題

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

單項選擇題

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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