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51. | oriented formation |
| 定向成型 |
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52. | orientation equipment |
| 定向设备 |
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53. | orientation error |
| 定向误差 |
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54. | bottomhole orientation |
| 井底定向 |
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55. | orientation factor |
| 定向系数 |
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56. | oriented crystallization |
| 定向结晶 |
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57. | orientation of orbit |
| 轨道定向 |
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58. | oriented management information system |
| 定向管理信息系统 |
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59. | orientational training |
| 定向训练 |
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60. | specular surface |
| 定向反射面 |
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