含银的

The oxidant 〓 plays indirect role in dissolving gold, and mainly controls the mix potential of Au in the alkaline thiourea solution. In which the "mix potential"is the decisive factor affecting the dissolution of gold. The reaction driving force is enough to have formamidine disulfide oxidize Au to Au〓 at the potential of about 0.4V. And then thiourea molecular complexes with Au〓 ion soon, which causes the fast dissolution of gold in the alkaline thiourea media. The dissolved weight of gold in 0.25 M thiourea solution with 0.05M Na〓SO〓 and 0.1M 〓 of pH 12. 5 by air at the temperature of 303K is 7. 8mg·cm〓 within 1hr.

在碱性硫脲溶金过程不起直接作用，而是通过S〓O〓来控制二硫甲脒有效形成的金在溶液中的混合电位；&混合电位&是影响碱性硫脲溶液溶金与否的决定性因素，在0.4V左右，有足够的推动力致使二硫甲脒氧化Au成Au〓，随后硫脲与Au〓络合形成稳定的络离子Au〓，从而使金快速溶解；温度为303K、pH为12.5时，在含0.05MNa〓SO〓、0.1M 〓及0.25M硫脲的溶液中，鼓入空气，金的溶解量在1hr内为7.8mg·cm〓；铜只有微量溶解，银、镍、铁则几乎不溶解。

On the basis of the fundamental theory as illustrated in binary Pb-Ag system,a segregating method by crystallization has been adopted to separate lead from lead-silver bullion of 20-25wt% Ag,and thus a production alloy more than 90 wt % Ag was obtained.

根据 Pb—Ag 二元相图的基本理论，采用凝析结晶分离的方法，分离铅银合金，使合金中的含 Ag 量由20～25%富集到95%以上，并探索了分离过程中的一些基本规律和现象。

A CEVd strain was isolated from Heibei province in China and its complete nucleotide sequences were identified.Accounting to the characteristic of structure of viroid, the nucleic acid from the positive material was detected by bidirectional PAGE.

柑桔裂皮类病毒快速检测技术体系的建立聚丙烯酰胺双向凝胶电泳法检测：将从阳性材料上提取的类病毒核酸，先在6％的聚丙烯酰胺非变性胶上进行第一向电泳，然后切割含类病毒分子的胶条，在变性条件下进行垂直或反向电泳，最后银染观察。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。