Toughened iav belongs rau iav kev nyab xeeb.TOUGHENED iav yog ib hom iav prestressed, txhawm rau txhim kho lub zog ntawm iav, feem ntau yog siv tshuaj los yog lub cev txoj kev, tsim compressive kev nyuaj siab rau ntawm iav, iav dais sab nraud quab yuam thawj offset surfac ...
Nyeem ntxiv