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| 81. | electrometric observation |
| 电子仪器观测 |
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| 82. | complete observability |
| 完全可观测性；完全能观测性 |
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| 83. | observed failure rate |
| 观测故障率;失效率的观测值 |
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| 84. | gamma observations |
| 伽马射线观测 |
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| 85. | Global Terrestrial Observing System |
| 全球陆地观测系统(陆地观测系统) |
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| 86. | soil and water loss observation |
| 水土流失观测 |
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| 87. | observational synthesis |
| 观测的综合工作; 综合观测结果 |
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| 88. | equivalent observation |
| 等效观测 |
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| 89. | temperature observation |
| 温度观测 |
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| 90. | instrument observation |
| 仪表观测 |
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