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| 观察孔; 窥视镜 | |||
| 观察镜; 视液镜; 看火镜 (для наблюдение за состоянием горения пламени печи, котла); 观火镜 (для наблюдение за состоянием горения пламени печи, котла); 检査窗; 査看〔用〕玻璃窗; 观察玻璃; 窥视孔玻璃 | |||
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| 观察镜视镜; 检查窗 | |||
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смотровое стекло : 8 phrases in 3 subjects |
| General | 3 |
| Level measurement | 1 |
| Technology | 4 |
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