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wei he yi xing qi shi 7 tian
Pages: 32
Year: Issue:  2
Journal: Modern Agricultural Machinery

Keyword:  GetLinkList(KeywordFilter('半圆月:5801高位置:4329月圆月缺:4247潮水的涨落:4126最低位置:2300线位:1598星期:1441时间周期:1113观察日:923起潮:719')'kw''CJFQ');
Abstract: <正> 古时,人类对潮水的涨落、月亮的圆缺倍感神秘。潮起潮去、月圆月缺十分有规律。对涨潮而言:由中线位置到涨至潮水最高位置;由潮水最高位置退回中线位置,时间是7天。对退
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