第31题:[单选题] The datum from which the predicted heights of tides are reckoned in the tide tables is ______. A. mean low water B. the same as that used for the charts of the locality C. the highest possible level D. given in table three of the tide tables 参考答案:B 【参考译文】潮汐表中用于计算预测潮高的基准面相同于所在区域的海图基准面。 【解 析】datum基准面 reckon估计、估算 mean low water平均低潮 locality地区、地点