解释为什么钡能形成过氧化物而铍则不能。Explain why barium forms peroxide but beryllium does not.然而铍的毒性限制了它的作用.However the toxic properties of beryllium limit its application.但如果用铝包覆铍,则可避免加工过程中及储存期间的中毒问题.Toxicity problem in manufacturing and...
An intimate friendship grew up between them.他们之间渐渐产生了亲密的友情。He lay on a coral beach where the cocoanuts grew down to the mellow - sounding surf.他躺在珊瑚礁的海滩上,那儿的椰树低垂到涛声轻柔的海面,一艘古船的残骸燃烧着,闪出蓝色的火苗.The idea for this book grew out...
...buffet cars in the railway company's bright red and yellow livery.上有铁路公司醒目的红黄专色的餐车The gondoliers wore green and white livery and silver plaques on their chests.船夫们穿着白绿两色的制服,胸前别着银质徽章.She was attended by servants i...
They made their getaway along a pavement on a stolen motorcycle.他们骑上偷来的摩托车沿着人行道逃走了。The little sailing-boat moved briskly along, heeling over under a nice breeze.小帆船在和风中倾侧着轻快地向前开。The Kaleses use moderate afternoon exercis...