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| con doble revestimiento | |||
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| a doble pared | |||
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A doppia parete : 10 phrases in 7 subjects |
| Chemistry | 2 |
| Construction | 1 |
| Energy industry | 2 |
| Materials science | 1 |
| Mechanic engineering | 2 |
| Transport | 1 |
| Water resources | 1 |
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