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| 51. | alphabetical key |
| 字母键 |
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| 52. | concentration key |
| 集合按钮|并席键 |
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| 53. | operational key |
| 操作键 |
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| 54. | transaction key |
| 事项关键码 |
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| 55. | cryptographic key |
| 密钥 |
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| 56. | elimination key |
| 排除法判读样片 |
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| 57. | associative key |
| 相联关键码 |
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| 58. | alphanumeric key |
| 字母数字键 |
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| 59. | transmitter key |
| 发报机电键 |
|
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| 60. | key clutch |
| 键槽离合器 |
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