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| 31. | Principle of Mechanic |
| 机械原理 |
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| 32. | 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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| 33. | elementary cycle |
| 基本环路;基本循环;基本周期 |
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| 34. | invariance theory |
| 不变性原理 |
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| 35. | The operation principles and the main parts of the on-line non-contact measurement system was presented in detail. |
| 详细介绍动态在线非接触式测控系统的基本工作原理及软硬件组成。 |
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| 36. | Principle of Microcomputer |
| 微机原理 |
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| 37. | The paper introduced this systematic fundament of the work, analyed in detail some problems in operation and their solutions. |
| 文中介绍该系统基本工作原理，详细分析晶闸管在使用过程中存在的一些问题及解决方法。 |
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| 38. | box principle |
| 抽屉原理 |
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| 39. | gravity feed principle |
| 自流进料原理|重力送料原理 |
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| 40. | principle of electrotechnics |
| 电工原理 |
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