management of underground minestopes ==> 矿山井下采场管理 management of weeds ==> 防除杂草 management of wholesale enterprises ==> 批发企业管理 ..
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覆盖播种防除杂草的效果变化较大；
在杂草的生物防除中，研究和应用得最早且证明效果最好的措施是利用昆虫防除杂草。
In the biological control of weeds, the measure which was first studied and applied, and which has also been proved effective is weed-control by insects.
简要介绍国内应用比较广泛的氯代酰胺类除草剂的合成方法，以及其在防除杂草方面的科学应用。
This paper briefly talk on synthesis method of chloroacidamide herbicide, and its science application on the farmland weed.
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