单项选择题
The propeller consists of a （）with several blades of helicoidal form attached to it.
A.shaft
B.boss
C.wheel
D.lever
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相关考题
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单项选择题
Oil pressure in the lubrication system is（）than the static sea water head to ensure that sea water cannot enter the sterntube in the event of seal failure.
A.higher
B.lower
C.very higher
D.very lower -
单项选择题
（）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 -
单项选择题
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
