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.
叶青超，尤联元，许炯心，等。黄河下游地上河发展趋势与环境后效。郑州：黄河水利出版社，1997。
Ye qingchao you lianyuan xu tongxin et al. development tendency and environmental aftereffect. Zhengzhou: yellow river conservancy press 1997.
以重钙、重晶石、叶腊石等为例，探讨立式磨在非金属矿超细产品生产中的应用。
The vertical miler mills applied to producing non-metallic minerals such as ground calcium carbonate, barite, pyrophyllite and others were discussed.
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