economicality经济性economicaladj.节俭的；经济的；合算的economically unsound project经济上不合算的项目economical selection cutting经济择伐economical decision-making经济决策economical quantities of oil石油的工业数量economical continuous rating经济连续出力economical cybernetics model经济控制论模型economically technical index经济技术指标economical working condition经济运行工况economically developed areas经济发达地区economically advanced regions经济较发达区