深析污水厂工程中顶管施工技术 - xzbu.com 中国论文网 关键词:顶管法， 施工技术， 注意问题 [gap=229]Key words: top tube method, construction technology, pay attention to the problem
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Methods: Using stratified sampling method to determine the survey places, The schistosomiasis in people and livestock were surveyed by the methods of nylon bag incubation and top - tube incubation.
方法：用分层随机抽样法确定调查点。 用尼龙袋集卵孵化法、顶管孵化法分别对人畜进行查病，用系统抽样结合环境抽样法开展螺情调查。
A binary alloy coating seamless steel tube top and a manufacture method belong to the field of laser processing.
一种双合金涂层无缝钢管顶头及制造方法属激光加工领域。
Disclosed is base steel composite material used for the top of a seamless pipe machine and the preparation method thereof, belonging to the application field of metal tube mills.
一种无缝钢管机顶头用的钢基复合材料及其制备方法，属于金属管轧机的应用领域。
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