Zhang Heng

Prevent corroding synthetic cut stone sintering device

Chitosan grafted hyperbranched polymer polyamide-amine (PAMAM), and preparation method and application thereof

Prevent synthetic cut stone sintering device that heating device is corroded

Erosion resistant fusion sintering device for artificial gem

Anti-opacifying artificial gem fusion-sintering device

Turbid synthetic cut stone sintering device of breast when preventing ejection of compact

Artificial-precious-stone fusing device with heating devices prevented from being eroded

Prevent newborn turbid synthetic cut stone sintering device

Method for cutting off temporary support of continuous girder bridge by wire saw

Method for drilling high-gas tunnel geological forecast prospect hole by using impact type drilling machine