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.<br>A:higher<br>B:lower<br>C:very higher<br>D:very lower

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

出自：海船船员证

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