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| 51. | conoscopic observation |
| 锥光观察 |
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| 52. | single observation |
| 单一观测 |
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| 53. | ground observation |
| 野外勘察 |
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| 54. | wild observation |
| 不切实际的观测值 |
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| 55. | geomagnetic observation |
| 地磁观测 |
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| 56. | controlled observation |
| 控制观察 |
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| 57. | representative observation |
| 典型观测;代表性观测 |
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| 58. | audit observation |
| 审计观察 |
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| 59. | random observation |
| (在工作抽样中所作的随机观察) 随机观察 |
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| 60. | wind observation |
| 风观测 |
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