本文从技术和经济两个方面对电压骤降进行了系统的分析。
Voltage sags are systematically analyzed from the views of technique and economy.
本文从技术和经济角度出发，提出气田开发规划技术经济指标计算公式。
Starting from technique and economy, the formula for calculating technical-economic indexes of gas field development programme is provided in this paper.
文章从技术和经济两方面，就盐化工业提高电流效率的合理途径，进行了分析和总结。
This paper analyzes and summarizes the rational approaches to increase electric current efficiency in salt and chemical industry both technologically and economically.
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