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.
实验证明该法行之有效，并可提高产品的合格率。
With the experiment it is proved that the quality of cement has been improved.
实验证明该法行之有效，并可提高产品的合格率。
With the experiment it is proved that the quality of cement has been improved.
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