根据计算机的(),计算机的发展可划分为四代。
A.体积
B.应用范围
C.运算速度
D.主要元器件
参考答案:D
David said that it was because of his strong interest in literature ___ he chose the course.
A.that
B.what
C.why
D.how
从事电焊作业的电焊工人必须( )。
A.戴绝缘手套
B.穿绝缘胶鞋
C.穿工作服
D.戴安全帽