采用砂培试验和电子显微技术，研究了不同水平氮锌配施对白三叶草根瘤发育和超显微结构的影响。
Sand culture experiment, electron microscopy technique were used to investigate the compound effects of nitrogen and zinc on nodule development and ultrastructure of white clover.
本文介绍了内昆铁路新杨柳湾隧道超近距离增建施工成功的具体施作方法和经验。
The method of the new Yangliuwan tunnel construction with small distance has been introduced in this paper.
单施磷肥，超粘限曲线在酸方大大降落于粘限曲线之下，韧限曲线也降低。
When we only applied phosphate fertilizer the curve of the ultra clay limit at the acidic field fell considerably below the sticky limit curve and the plastic limit curve fell also.
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