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根外施氮对短枝型苹果幼树光合速率影响的研究
【机 构】
：
山西农业大学
【出 处】
：
山西农业大学
【发表日期】
：
1992年期
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教育就是一朵云推动另一朵云,一棵树摇动另一棵树,一个灵魂唤醒另一个灵魂的过程.它是一门艺术,需要智慧.有时要知道坦诚的心未必能获得理解和信任.只有智慧的碰撞才能让人敞