An excessive amount of water is prevented from entering a vessel using a water lubricated stern tube bearing by the use of the （）.<br>A:propeller hub<br>B:lignum vitae<br>C:shaft packing<br>D:labyrinth seal

An excessive amount of water is prevented from entering a vessel using a water lubricated stern tube bearing by the use of the （）.
A:propeller hub
B:lignum vitae
C:shaft packing
D:labyrinth seal

出自：海船船员证

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