建立了精密播种机接输种管后田间植株分布的动态模型。
A dynamic field plant distribution model with the seed drop tube is established in this paper.
悬索式管桥是长输管道跨越中常用的一种形式，其结构主要由主索、抗风索、塔基和锚固系统及梁式管桥等部分组成。
Suspension pipe bridge is a kind of common structural form consisted mainly of main cable wind cable tower foundation anchor system and girder form pipe bridge.
通清管技术在油气集输中是一种常用的用来清除管道内杂质、蜡、垢以及排空管道内存液的有效办法。
Passing ball cleaning pipe technique is a very effective method to clean up the impurity, wax and filthy and to exclude the existing liquid in oil gas transmission pipe.
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