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- conservation of natural resources (2)
- economic history (2)
- food supply (2)
- power resources (2)
- technological innovations (2)
- 通俗读物 (2)
- analog-to-digital converters (1)
- digital-to-analog converters (1)
- educational innovations (1)
- electric circuits (1)
- electric network synthesis (1)
- mathematical analysis (1)
- modulators (electronics) (1)
- non-formal education (1)
- problems, exercises, etc (1)
- 人际关系 (1)
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- 数-模转换器 (1)
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出版社:
Unesco, International Institute for Educational Planning,
出版日期: 1988.
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