钻石(金刚石)由纯碳所组成。

Diamonds are made from carbon.

youdao

在实验室中制备出含碳量低于0.025％合格的工业纯铁。

The qualified industrial pure iron whose carbon content is below 0.025% has been made in laboratory.

youdao

在实验室中制备出含碳量低于0.025％合格的工业纯铁。

The qualified industrial pure iron whose carbon content is below 0.025% has been made in laboratory.

youdao