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| 31. | calibration mark |
| 校正标志 |
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| 32. | marking of lifesaving appliance |
| 救生设备标志 |
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| 33. | product marking |
| 产品标志 |
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| 34. | sign transporter |
| 标志运输车 |
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| 35. | national boundary marker |
| 国界标志 |
|
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| 36. | adjustment mark |
| 照准标志 |
|
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| | |
| 37. | prospecting guide |
| 勘探标志 |
|
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| | |
| 38. | gamma-ray signature |
| 伽马射线标志 |
|
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| | |
| 39. | notch generator |
| 标志发生器 |
|
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| | |
| 40. | signs of failure |
| 断裂标志 |
|
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