A considerable portion of electric contact failure is caused by environmental factors, of which dust contamination is an important factor on electric contact reliability.

在电接触故障中，由环境因素导致的占了很大一部分，其中尘土污染是影响电接触可靠性的一个重要因素。

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This paper analyzed the behaviour of tungsten and arsenic contamination factor in phosphorous-arsenic slag under the condition of pressure digestion with NaOH for wolframite concentrate.

分析了在黑钨精矿碱压煮条件下，磷砷渣中钨和污染因子砷的行为。

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