第一次使用会有黑尘，请别担心，这只是碳灰。

Black dust will appear in first rinse. Don't worry, it's only carbon.

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因此，对飞灰含碳量预测技术的研究是非常必要也是很有应用价值的。

So the study of the fly ash carbon forecast technique is very essential and important.

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白口铸铁含碳量较灰口铸铁稍低。

White cast iron is cast iron ash carbon content is a bit low.

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白口铸铁含碳量较灰口铸铁稍低。

White cast iron is cast iron ash carbon content is a bit low.

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