Explain why barium forms peroxide but beryllium does not.解释为什么钡能形成过氧化物而铍则不能。However the toxic properties of beryllium limit its application.然而铍的毒性限制了它的作用.Toxicity problem in manufacturing and storage might be alleviated ...
She caught the insect by inverting her cup over it.她用杯子扣住了那只昆虫.He started out inverting 2,000,000, but eventually invested only 200,000.他们开始打算投资200万, 可是后来只有20万.Level - shifting or polarity inverting circuitry must be emp...