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51. | theory of engagement |
| 啮合原理 |
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52. | Principles of Network |
| 网络原理 |
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53. | Principles of Ship Designing |
| 船舶设计原理 |
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54. | Kirchhoff's principle |
| 基尔霍夫原理 |
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55. | Principles of Statistics |
| 统计学原理 |
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56. | minimum principle |
| 最小原理 |
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57. | Principles of Waste Water Processing |
| 废水处理原理 |
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58. | subtractive theorem |
| 减色原理 |
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59. | qigong mechanism |
| 气功原理 |
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60. | Principle of Automatic Control |
| 自动控制原理 |
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