A. 【1】high=mid-1 【2】low=mid+1 B. 【1】high=mid+1 【2】low=mid-1 C. 【1】low=mid-1 【2】high=mid+1 D. 【1】low=mid+1 【2】high=mid-1
A. 【1】x-y,x+y,【2】x-y,x+y B. 【1】x+y,x-y,【2】z+y,z-y C. 【1】z-y,z+y,【2】x-y,x+y D. 【1】z-y,z+y,【2】z-y,z+y
A. 烧结黏土砖 B. 烧结页岩砖 C. 烧结煤矸石砖 D. 烧结粉煤灰砖