我发觉到热酸似乎把工作做得更好。

I have found that the hot acid seems to do a better job.

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研究了从锌焙烧烟尘常压热酸浸出液中沉淀针铁矿的过程。

Precipitation process of the goethite from hot acid leaching solution of zinc concentrate roast dust was investigated.

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本文采用热酸浸蚀试验，化学成份分析和金相分析等手段，对45钢轴所出现的发纹进行分析。

The hair lines of 45 steel driving axle when quenching and tempering was analysed by heat etching, chemical analysis and metallographic.

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