| 工程设计理论、方法与技术 |
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| 电气设计中的发明原理分类研究——发明原理之No.21至No.40 |
| 孙建广,檀润华,魏文超 |
| 河北工业大学 创新设计研究所, 天津 300130 |
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| Research on inventive principles classification of electrical design:Principles No.21 to No.40 |
| SUN Jian-Guang,TAN Run-Hua,WEI Wen-Chao |
| Institute of Design for Innovation, Hebei University of Technology, Tianjin 300130, China |
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