cobalt oxide

例句：

1. 1.The coating on the surface of this metal is made up of cobalt oxide.
   这种金属表面的涂层是由钴氧化物制成的。
2. 2.Cobalt oxide is a useful catalyst for many chemical reactions.
   钴氧化物是许多化学反应的有用催化剂。
3. 3.The process of producing cobalt oxide involves heating a mixture of cobalt and oxygen to high temperatures.
   生产钴氧化物的过程涉及将钴和氧的混合物加热至高温。