This paper break the traditional of economic benefit which analyze main from the way that the water saving irrigation engineering item commence, but take farm crop as the main research object.
本篇论文打破了传统的节水灌溉经济效益分析主要从工程项目入手的方式，而以作物为主要的研究对象。
Construction method by steps is used for pre embedded parts of steel structure engineering foundation with easy construction, high accuracy and good quality, and the economic benefit is remarkable.
在钢结构工程基础预埋螺杆的施工中，采用一次就位分步施工法，施工简单、精度高、质量好，经济效益显著。
Sewage has a significant effect on the viscosity of polymer and a direct influence on the oil displacement result and economic benefit of polymer-injection engineering.
污水对聚合物的粘度影响极大，直接关系到注聚合物工程的驱油效果和经济效益。
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