单选题Admiralty EasyTide（）.Ahas little use for ocean-going marinersBpermits the mariner to select and simultaneously calculate tidal heights for multiple ports for up to seven daysCincludes periods of daylight and nautical twilight，moon phases and a springs and neaps indicatorDis supplied in the form of a single CD which contains the calculation program and the seven geographic Area Data Sets（ADS）providing global coverage
单选题
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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