MAC

For sinter with 25% and 50% MAC fines the iron oxides mainly consisted of hematite and magnetite, the bonding phase were mainly dicalcium silicate, glassiness, and a few amount of calcium ferrite.

配比为25%和50%的两种烧结矿中铁氧化物均赤铁矿、磁铁矿为主，粘结相主要铁酸钙、硅酸二钙和玻璃质为主，但铁酸钙数量不多。

Altough I didn’t know the difference between a Mac and PC, once Macs were so beige, palid and ordinary as any lowsy PC.

比如微软和苹果，都有它们各自的指导手，细规定了颜色，透视及其他细节。