畴壁
参考答案:
相邻磁畴间的边界区域,其厚度相当于许多个单位晶格点阵单元,在畴壁中磁矩的取向从一个磁畴的方向相邻磁畴的方向逐渐改变。
为反刍动物配制日粮时可使用鱼粉,但不可使用骨粉。
This kind of software for English study _____ a lot of students who are weak in oral English.
A. leads to
B. appeal against
C. contributes to
D. appeals to