A method is proposed to determine free native silver and free silver sulphide in lead-zinc concentrate.
拟定了分离测定铅锌精矿中游离硫化银和游离自然银的方法。
A polished silver strip incubated in such fuels interacts with active sulphide and is corroded by electrical-chemical reaction.
浸入这种燃料中的银片与活性硫化物相互作用，因发生电化学反应而被腐蚀。
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