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單項(xiàng)選擇題

Which of the devices listed, when used on an electro-hydraulic steering gear, keeps the movement of the redder closely in step with the steering wheel?（）

A.The follow-up gear
B.The rudder angle indicator
C.The synchronous electric transmitter
D.A rudder angle limit switch

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單項(xiàng)選擇題

Propeller pitch speed minus ship speed divided by the propeller pitch speed is termed （）.

A.apparent slip
B.tree slip
C.pitch
D.propulsive efficiency

單項(xiàng)選擇題

A multistage centrifugal pump can be BEST described as having （）.

A.two or more impellers housed together in one casing and mounted on a single shaft
B.a single stepped impeller mounted in a progressively staged casing
C.a large radial clearance between the impeller and casing to prevent overheating due to
D.an increase in the discharge velocity of the liquid with a corresponding decrease in pressure through the stages