钛和钛合金被认为是二十一世纪的重要金属材料.工业上以金红石(主要成分是TiO2)为原料生产金属钛.其工艺流程如下:
甲:____;乙:____.
— How can I stay in shape?
— A well-balanced diet together with regular exercise ______ you'll make it.