读图7并回答问题小题1开垦p平原首先应该 A.引入灌溉水源 B.增加土壤肥力c.平整土地 D.排水小题2国家在p平原兴建了许多大 Template




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tomski读图7并回答问题小题1开垦p平原首先应该 a.引入灌溉水源 b.增加土壤肥力c.平整土地 coloring