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| 31. | The theory is simple. |
| 原理很简单： |
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| 32. | Principle of Microcomputer |
| 微机原理 |
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| 33. | principle of electrotechnics |
| 电工原理 |
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| 34. | Principle of Mechanic |
| 机械原理 |
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| 35. | gravity feed principle |
| 自流进料原理|重力送料原理 |
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| 36. | variation principle |
| 变分法原理 |
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| 37. | an absolute principle |
| 绝对原理 |
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| 38. | box principle |
| 抽屉原理 |
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| 39. | invariance theory |
| 不变性原理 |
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| 40. | transfer principle |
| 传递原理 |
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