... aluminium oxide film hygrometer 氧化铝薄膜湿度计 white aluminium oxide 白色氧化铝 aluminium oxide crucible 氧化铝坩埚 ...
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A basic variety of aluminium oxide, white colour its hardness is higher and toughness slightly lower than that of a.
刚玉的基本品种，白色，与棕刚玉相比，硬度高、性稍低。
A basic variety of aluminium oxide, white colour its hardness is higher and toughness slightly lower than that of a.
棕刚玉的派生品种，磨料由微小晶体构成，颜色与棕刚玉相似，强度高。
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