According to the comprehensive benefit of technology and economy,the lees content of 20% in the fly ash-lees compound media was the optimumproportion for planting shamrock.
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释义
从技术和经济的综合效益来看,在粉煤灰原酒糟复合基质中酒糟含量20%25为适宜种植三叶草的最佳配比。
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