介绍了喷气纺纱机的主要性能，对喷气纺纱的生产工艺及成本效益进行了分析与研究。
The main properties of jet spinning machine are introduced. The production technology and cost benefit of jet spinning are analysed and studied.
对上述关键节点进行分析与研究，将直接影响到房地产开发的成本与效益。
Carries on the analysis and the research to the above essential node, immediate influence to property development cost and benefit.
负外部性规则是公共经济学要研究解决的重要问题，其解决的经济效率反映在外部性处理的成本与效益上。
Negative externality rules are an important issue in public economics, and the economic efficiency in solving negative externalities is reflected in the costs and benefits in dealing with them.
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