A research is madethe properties of compound cement consisting of Alite - sulphoaluminate cement and Portland cement.研究了阿利特 - 硫铝酸盐水泥与硅酸盐水泥复合所制备的水泥的性能....
Annie's work reflects her philosophy that life is full of mysteries.安妮的作品反映了她的人生哲学，即生活充满神秘色彩。It is one of the great unsolved mysteries of this century.这是本世纪尚未解开的大奥秘之一。She spent her life plumbing the mysteries of the...