Any of a series of chemically similar, radioactive elements with atomic numbers ranging from 89 ( actinium ) through 103 ( lawrencium ). 锕类任何化学性质相似, 原子序数在89 ( 锕 ) 与103 ( 铹 ) 之间变化的放射性元素.
现在经济开发区怎样了?How is the economic development zone going on?城市的这一部分已被划为重新开发区.This part of the city has been zoned for redevelopment.该城已被定为开发区.The town has been designated ( as ) a development area....
Stainless steel bolts and nuts shall be tightened on manhole covers.人孔盖使用不锈钢螺栓和螺母拧紧.We also supply pickling line, Degreasing line, Annealing furnace for stainless steel.我公司还承揽各种不锈钢酸洗生产线 、 不锈钢脱脂生产线 、 光亮退火生产线等.This paper i...