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| 51. | primary sensitive element |
| 主灵敏元件 |
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| 52. | sensitive microrelay |
| 微型灵敏继电器 |
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| 53. | sensitive mini-relay |
| 小型灵敏继电器 |
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| 54. | He's a keen mind. |
| 他头脑灵敏。 |
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| 55. | sensitive upright drilling machine |
| 立式灵敏钻床 |
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| 56. | sensitive polarized relay |
| 灵敏极化继电器 |
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| 57. | ultrasensitive magnetometer |
| 超灵敏磁强计 |
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| 58. | neutron sensitive material |
| 中子灵敏材料 |
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| 59. | sensitive indicator |
| 灵敏指示物 |
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| 60. | sensitive relay valve |
| 灵敏中继阀 |
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