短語詞組短語economical l operation 經濟運行safety and economical operation 安全經濟運行system economical operation 系統(tǒng)經濟運行systematic economical operation 系統(tǒng)經濟運行motor economical operation 電動機經濟運行economical operation and management 經濟運行琯理safe and economical operation 安全與經濟運行Hydropower Plant Economical Operation 水電廠經濟運行power grid economical operation 電網經濟運行 返回 economical operation