單項選擇題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
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1.單項選擇題（）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
2.單項選擇題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
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