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 ...
Amorphous beryllium hydride , as ablator, can increase conversion from laser to X - rays .非晶 BeH2 材料作为烧蚀层, 掺入高Z元素后可以提高激光 -X 光的转换效率.Toxicity problem in manufacturing and storage might be alleviated by coating beryllium wi...
这个龅牙的巴西人,以此项殊荣结束了具有纪念意义的这一年.He hopes to have all Brazilians aby the end of his four - year term in office.那些天生有唇裂或龅牙的人,也许会口齿不清.Those born with a harelip or buck teeth may not be able to speak clearly....
隼遍布全球, 营巢于树洞内和悬崖的突出部.Falcons, found worldwide, commonly nest in tree holes or cliff ledges.上述植入件可具有侧面突出部, 诸如侧面销, 以便与组织接合.The implant may have a side projection, such as a side pin, for engaging tissue....
His works include operas, symphonic, choral and chamber music.他的作品包括歌剧, 交响乐, 合唱和室内乐.Entering the 1990 s, Chinese symphonic creation found itself in the doldrums.进入90年代之后, 我国交响音乐创作的状态有些寂寥.Nature's symphonic world was...
She found a book containing words strangely charactered in red ink.她找到一本书,奇怪的是里面有一些用红墨水写的字.Charactered by its remarkable coagulant performance, PFS attracts people's attention.聚合硫酸铁以其良好的絮凝性能倍受人们的关注.Mohist logic has ...