问：为何年度账菜单是置灰不能使用？

Q: why annual account menu is set ash can not be used?

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问：为何账套菜单的备份置灰不能使用？

Q: why the account menu backup set ash can not be used?

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在实验室电炉静置煅烧条件下，研究了硫酸钙和亚硫酸钙、含亚硫酸钙的脱硫灰和石膏在水泥熟料煅烧过程中硫的逸放。

The sulfur emissibility during burning cement clinker with calcium sulfate, calcium sulfite gypsum and desulphurize slag that consist of CaSO3 separately were studied in laboratory electric stove.

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