cobalt unit

例句：

1. 1. The new cobalt unit has been installed in thefactory.
   新的钴单位已经安装在工厂里。
2. 2.The cobalt unit is used tomeasure the concentration of cobalt ina sample.
   钴单位用于测量样品中钴的浓度。
3. 3. The cobalt unitis an important tool for scientists to studythe properties of metals.
   钴单位是科学家研究金属性质的重要工具。