fused corundum
fused corundum
下列磨料的硬度从小到大排列为： A: corundum B: quartz C: diamond D: silicon carbide
下列磨料的硬度从小到大排列为： A: corundum B: quartz C: diamond D: silicon carbide
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fused corundum
下列磨料的硬度从小到大排列为： A: corundum B: quartz C: diamond D: silicon carbide