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| margin of safety | |||
| safety clearance | |||
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安全限界 : 13 phrases in 10 subjects |
| Aviation | 1 |
| Business | 1 |
| Cryptography | 1 |
| Electronics | 1 |
| Finances | 1 |
| Management | 1 |
| Metallurgy | 2 |
| Oil / petroleum | 1 |
| Project management | 1 |
| Technology | 3 |
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