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新エネルギーと節電  New energy sources and saving energy

第1章 もったいない無駄と必要な無駄
1.1 夜の停電
1.1.3 安全なエネルギー源
Trajectory of Energy Conservation Grand Prize-winning Technology Development
Chapter 1 Wasteful Waste and Necessary Waste
1.1 Power Outage at night
1.1.3 Safe Energy Sources