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剑桥雅思听力全真试题 11

Yeah, oh, I wanted to check the chemicals we used in the lab when we analysed those samples — was it potassium chromate and silver nitrate?

没错。对了,我想确认一下在实析那些样品时使用的化学制剂,我们用的是铬钾和硝银,对吗?

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When the metal coating is punctured or scratched, the capsules in the damaged area burst and ooze restorative liquids, in the form of compounds called trivalent chromates.

当金属的覆盖扎刺或划损时,损区域的胶囊将会破裂并渗出具有恢复性的液体---三价铬钝化化合物。

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