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51. | census regulation |
| 统计法指南|普查规则 |
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52. | filament regulation |
| 灯丝电路调节 |
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53. | factory regulation |
| 工厂规章 |
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54. | self regulation |
| 自动第 |
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55. | secondary regulation |
| 二次调节 |
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56. | working regulation |
| 工作规程 |
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57. | twist regulation |
| 扭绞调整 |
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58. | smooth regulation |
| 平滑调节 |
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59. | speed regulation |
| 变速调节 |
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60. | sanitary regulation |
| 卫生条例 |
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