1、 Division of four geographical regions<br>1. The geographical significance of Qinling Huaihe line<br>(1) Where the 0 ℃ isotherm passes in January<br>(2) Where the 80q mm isoprecipitation line passes<br>(3) Boundary between warm temperate zone and subtropical zone<br>(4) Temperate monsoon climate and subtropical monsoon climate<br>(5) Huibailiang library V / 2 on the boundary between humid and semi humid regions<br>(6) Members of the Yellow River and Yangtze River basin boundary library are free of charge<br>(7) North and south, paddy field and dry land<br>(8) Temperate deciduous broad-leaved forest and subtropical evergreen broad-leaved forest<br>
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