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| 暗〔黑〕度计; 光〔显像〕密度计; 透明〔乳浊〕度仪 | |||
| 排气分析消光烟度计; 不透光度仪 | |||
| 不透明度仪 | |||
| 透明度测定仪; 光电浊度计 | |||
| 暗度计; 光密度计 | |||
| 浊度仪; 黑度计; 透光率计; 不透明度计; 不透明度测试仪 | |||
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opacimeter : 3 phrases in 1 subject |
| Automobiles | 3 |
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