Technology has 4 levels
1. Technology, beginners can supply domestic. Or can be developed in a short time, such as a refrigerator, telephone, etc. 2
.Intermediate technology, often be bought from abroad. But can develop in domestic. If the continuous development plan, such as television, audio, etc.
3.High technology, to buy the equipment from abroad, but can be used by people. If developed in the country will have to buy the core technology from abroad, such as computers, mobile phones, etc.
4.High technology, have to buy equipment and skills to operate from abroad such as transport large communication system
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