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Effect of Nitrogen Supply on the Nitrogen Use Efficiency of an Annual Herb, Helianthus annuus L. Value influence of different compatibilities of main active partsin Yangyintongnao granule on pharmacokinetics parameters in ratswith cerebral ischemia reperfusion injury by total amountstatistic moment method Effects of Plant Sizes on the Nitrogen Use Strategy in an Annual Herb, Helianthus annuus (Sunflower)