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21. | integrated test system |
| 成套测试设备 |
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22. | instrumentation system |
| 测试设备系统 |
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23. | (digital nervous system) |
| (domain name system) 域名系统,[港]区位名址系统 |
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24. | system input device |
| 系统输入设备 |
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25. | ground equipment system |
| 地面设备系统 |
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26. | system utility device |
| 系统公用设备 |
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27. | water spray system |
| 喷雾洒水设备 |
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28. | data sorting system |
| 数据分类设备 |
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29. | system residence device |
| 系统常驻设备 |
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30. | telescoping wellhead system |
| 伸缩式井口设备 |
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