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單項(xiàng)選擇題

（）is used to prevent the entry of sea water to the machinery space.

A.A special sealing gland
B.Propeller
C.Tailshaft
D.Sterntube bearing

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單項(xiàng)選擇題

The thrust from the propeller to the hull of the ship is transferred by（）

A.tie rod
B.thrust block
C.bedplate of main engine
D.frame of main engine

單項(xiàng)選擇題

The transmission system transmitting power from the engine to the propeller is composed of shafts, bearings, and（）

A.propeller
B.flying wheel
C.main engine
D.crankshaft

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