一个三位数,十位数字为a,百位上的数字是十位上的2倍,个位数字比十位数字大2,用代数式表示这个三位数是______.
这个三位数的2a×100+10a+a+2=211a+2.
I urged all the students to take the initiative in their own hands to determine their goals for further pursuit rather than to depend on their teachers and their parents.
A.determine
B.determining
C.in determining
D.for determining
目前在轧钢生产中采用最多的原料是()。
A.钢锭
B.锻轧钢坯
C.连铸钢坯