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| back-up system; backup system; standby system; backup | |||
| sistema di riserva: 14 phrases in 9 subjects |
| Communications | 1 |
| Economy | 1 |
| Electric motors | 1 |
| Electronics | 2 |
| Finances | 3 |
| General | 1 |
| Information technology | 3 |
| Mechanic engineering | 1 |
| Transport | 1 |
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