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| Subject | English | Italian |
| weld. | flat characteristic of an arc welding power source | caratteristica piana per una sorgente di saldatura ad arco |
| mech.eng. | flat characteristic valve | valvola ad apertura lenta |
| earth.sc., mech.eng. | flat H Q characteristic | curva HQpiatta |
| health. | flat weighting characteristic | risposta piatta in frequenza |