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Admiralty EasyTide（）.
A:has little use for ocean-going mariners
B:permits the mariner to select and simultaneously calculate tidal heights for multiple ports for up to seven days
C:includes periods of daylight and nautical twilight，moon phases and a springs and neaps indicator
D:is supplied in the form of a single CD which contains the calculation program and the seven geographic Area Data Sets（ADS）providing global coverage

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出自：海船船员证

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