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| 11. | The theory is simple. |
| 原理很简单： |
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| 12. | comparative principle of satisfying needs |
| 满足需要比较原理;满足需要可比原理 |
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| 13. | principle of electrotechnics |
| 电工原理 |
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| 14. | gravity feed principle |
| 自流进料原理|重力送料原理 |
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| 15. | Principle of Microcomputer |
| 微机原理 |
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| 16. | invariance theory |
| 不变性原理 |
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| 17. | Principle of Mechanic |
| 机械原理 |
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| 18. | an absolute principle |
| 绝对原理 |
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| 19. | box principle |
| 抽屉原理 |
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| 20. | variation principle |
| 变分法原理 |
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