含灰量低的中等变质程度的煤氧化活性最高；

The most reactive coal is in the middling coal-bank;

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通过室内试验，分析了不同含灰量时灰土的击实性和击实灰土的抗剪性。

Based on the laboratory tests, the compaction property of lime-loess and it's shearing property are analysized when the lime content is different.

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据统计，铸件废品有50％是由于型砂不合格造成的，而砂子温度、含灰量的多少又是影响型砂性能的重要因素。

Scraps up to 50% are statistically due to the unqualified molding sand and the main influential factors are sand temperature and amount of dust.

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