The issue of type selection of construction contract has been studied on engineering fields while less were researched in economics for further discussion.
工程合同类型选择问题在工程实践中研究较为广泛，然而对于该问题的更深层次的探讨，特别是在经济学领域的探索却相对较少。
The type-selection and design of IR optical window are meaningful for engineering application.
选型方案和设计方法对工程应用具有实际指导意义。
Introduction on the design principle, selection method and characteristics of a new type of biotreatment septic tank were presented, and putting forward several problems in engineering implementation.
介绍了新型生物处理化粪池的设计原理、选用方法及特点，提出了工程实施中应注意的几个问题。
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