The specimen below is the result of sawing and multiple treatments with HF acid and waxing.
上边石块是含有金的石英原石。下边的标本是经过酸和蜡处理过的标本。
The results showed that HF acid has remarkable deashing capacity for coal and graphite with high Si and low Ca content.
结果表明,HF酸对高硅低钙含量的煤和石墨有显著的脱灰效果;
Constancy of chemical etch rate method was modified so as to reduce the influencing factors such as temperature and concentration of HF acid. The efficiency and accuracy are improved.
基于差动原理对HF酸恒定化学蚀刻速率法进行改进,以降低环境(温度、HF酸浓度等)变化对测量结果的影响,从而提高测量效率和测量准确性。
HF And let's take an example, HF, hydrofluoric acid, all right?
这里有个例子,氢氟酸,对吧?
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