难治性根尖周炎
Refractory and chronic periapical periodontitis
Refractory apical periodontitis
Refractory periapical periodontitis
南翼山-尖顶山地区
Nanyishan-Jiandingshan area
纳米镁铝尖晶石
nano-crystalline magninium-aluminia spinel
密纹尖额溞
Alona verrucosa lineolata
镁质铁铝尖晶石耐火材料
Magnesia-hercynite refractories
镁铁铝尖晶石耐火材料
Magnesia-hercynite refractories