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| 公开/私有: | 公开 私有 |
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| 公开/私有: | 公开 私有 |
- social aspects (4)
- social policy (3)
- airplanes (2)
- welfare state (2)
- 燃料电池 (2)
- 研究 (2)
- 项目管理 (2)
- consumers' preferences (1)
- cost control (1)
- economic development (1)
- electric equipment (1)
- electric power failures (1)
- electric power system stability (1)
- electronic equipment (1)
- energy storage (1)
- environmental aspects (1)
- fuel cells (1)
- global financial crisis, 2008-2009 (1)
- happiness (1)
- health aspects (1)
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