N → a plural of calx
The solid fuel consumption of sinter has been decreased greatly through insisting on using high-quality calces.
通过坚持使用高质量的生石灰，大大降低了烧结矿的固体燃料消耗。
The solid fuel consumption of sinter has been decreased greatly through insisting on using high-quality calces, practising high feed sintering, actualizing many techniques in solving key problems.
烧结坚持用好生石灰，推行厚料层 烧结，实施多项技术攻关，固体燃耗大幅度下降；
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