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| 81. | Oxygen Index Meter |
| 氧指数仪 |
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| 82. | averaging device |
| 平均仪 |
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| 83. | hydrological instrument |
| 水文仪 |
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| 84. | surface area apparatus |
| 表面积仪 |
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| 85. | fifth wheel instrument |
| 五轮仪 |
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| 86. | pendulum instrument |
| 摆仪 |
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| 87. | fifth wheel method |
| 第五轮仪 |
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| 88. | a direction finder |
| 测向仪 |
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| 89. | over-load meter |
| 过载仪 |
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| 90. | seismic sea wave apparatus |
| 海啸仪 |
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