E life-cycle model生存周期模型
negative e half-cycle suppressor负半波遏抑器
e-business cycle电子商务周期模型;电子商务环;电子商务周期
E-commerce Trade Cycle电子商务交易流程
open-cycle e开环
Life-cycle e寿命周期
E multicycle controlled by half-cycle按半周进行的多周期控制
vapor-cycle e condensor蒸汽循环冷凝器