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| 51. | registration mark |
| 登记号 |
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| 52. | navigation mark |
| 航道标志导航标志 |
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| 53. | midchannel mark |
| 中央标 |
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| 54. | identifying mark |
| 识别标记 |
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| 55. | bottomside mark |
| 底面标记 |
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| 56. | cancellation mark |
| 次品标记 |
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| 57. | adjustment mark |
| 照准标志 |
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| 58. | identification mark |
| 辨识标志 |
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| 59. | calibration mark |
| 校正标志 |
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| 60. | containing mark |
| 容量刻度 |
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