问题:
A . gives daily predictions of the times and heights of high and low water for a selection of Standard Ports
B . lists the principal harmonic constants for all those ports where they are known,for use for prediction by the Simplified Harmonic Method of Tidal Prediction
C . is a comprehensive guide for the yachtsman
D . permits the mariner to select and simultaneously calculate tidal heights for multiple ports for up to seven day
● 参考解析
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