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When daylight savings time is kept，the time of tide and current calculations must be adjusted.One way of doing this is to（）.
A:Add one hour to the times listed under the reference stations
B:Subtract one hour from the time differences listed for the subordinate stations
C:Apply no correction as the times in the reference stations are adjusted for daylight savings time
D:Add 15° to the standard meridian when calculating the time difference

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出自：海船船员证

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