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| safety tool (防止在零部件加工时工作人员受伤害而专门设计的工具) | |||
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| safety tool | |||
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安全工具 : 9 phrases in 5 subjects |
| Aviation | 2 |
| Cryptography | 1 |
| Electronics | 4 |
| Project management | 1 |
| Securities | 1 |
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