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| 51. | extraction mark |
| 录取标志 |
|
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| | |
| 52. | accurate indication |
| 正确标志 |
|
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| | |
| 53. | space indicating |
| 空间标志 |
|
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| | |
| 54. | hull class notation |
| 船体标志 |
|
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| | |
| 55. | substitution indices |
| 替换标志 |
|
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| | |
| 56. | characteristic indication |
| 特征标志 |
|
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| | |
| 57. | [England] via air mail | [France] par avion | [Spain] correo aereo |
| 航空[标志 |
|
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| | |
| 58. | identification markers (marking) |
| 鉴定标志 |
|
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| | |
| 59. | capsize indicator |
| 倾覆标志 |
|
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| | |
| 60. | sign of failure |
| 破坏标志 |
|
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| | |