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- efficiency control 1
- efficiency criterion 1
- efficiency factor 1
- efficiency of economic activity 1
- efficiency of labor 1
- efficiency of marketing costs 1
- efficiency of passenger transportations of KTV 1
- efficient resource management 1
- elastic stage of work 1
- elastic tool 1
- elderly people 1
- elderly population 1
- electric arc surfacing 1
- electric charge 1
- electric motor 2
- electric transport 1
- electrical and electronic equipment 1
- electrical impedance 1
- electrical phenomena that accompany the grinding 1
- electro treatment 1