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...
No running, no chasing, no littering, no smoking and no eating.场内不准奔跑 、 追逐, 不准乱扔杂物 、 吸烟及饮食任何形式的食物.She was silent for a while, lost in thought, staring at the books littering the room.一时间她默不作声，直想得入了神，双眼直愣愣地盯着房间里扔得到处都是的书。I...
Therefore , to discompose these signals by filtering can help to understand possible sedimentary dynamic procedures.用滤波方法分析分解信号,可以了解不同沉积作用特征并进一步分析可能的环境变化控制机制.The grin of his friend discompose jack when he tried to make h...
Fagin stealthily descended the kitchen stairs.费根蹑手蹑足下扶梯到厨房去.They descended the slope towards the hamlet.他们顺坡下山, 向那个村子走去。He was ultimately overthrown and the country descended into chaos.他最终被推翻，整个国家则陷入了混乱。By the end of hi...