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| 91. | section measurement |
| 路段观测 |
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| 92. | discharge observatio |
| 量观测 |
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| | |
| 93. | fix by observation |
| 观测定位 |
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| 94. | photographic observation |
| 照相观测 |
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| 95. | dependent observatio |
| 相关观测 |
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| 96. | magnetic observation |
| 磁力观测 |
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| 97. | meridian observation |
| 子午观测 |
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| | |
| 98. | target observation |
| 目标观测 |
|
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| | |
| 99. | complete observation |
| 完全观测 |
|
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| | |
| 100. | observation balloon |
| 观测气球 |
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