美国灌溉统计1988 ~1999 年美国灌溉面积 |
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摘 要: | (单位:hm2)年份灌溉面积喷灌面积喷灌占灌溉面积比例(%)198823,566,7589,533,33840.45198923,316,7789,800,31242.03199023,758,3538,793,56837.01199123,293,8189,017,71738.71199223,960,96110,145,39042.34199323,899,0849,813,92641.06199424,290,79310,076,02641.48199524,491,63810,108,4…
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