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| 短缺零件; 结构中寿命最短的零件 | |||
| 关键件; 关键部分 | |||
| 主要部件; 关键部位 | |||
| 要害机件 | |||
| 关键部件 | |||
| 主要零件 | |||
| 要害部位; 主要机件 | |||
| 要害部分 | |||
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critical part : 1 phrase in 1 subject |
| Space | 1 |
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