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The Experimental Lighthouse-buoy has no navigational significance and may be removed at will.The above sentence means（）.
A:It's of no use for navigation and would be removed with notice
B:It's useful in navigation and may be removed without notice
C:It's helpless in navigation and may be removed without notice
D:It's helpful in navigation and may be removed without notice

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出自：海船船员证

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