题目内容

确定基本偏差主要是为了确定是( )

A. 公差带的位置
B. 公差带的大小
C. 配合的精度
D. 工件的加工精度

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在螺纹底孔的孔口倒角,丝锥开始切削时是( )

A. 容易切入
B. 不易切入
C. 容易折断
D. 不易折断

The most widely used OS in the world is Windows which provides users with a graphical user interface. ( )

A. 对
B. 错

An operating system is the basic software that controls a computer. ( )

A. 对
B. 错

The second generation computers were based on vacuum tubes. ( )

A. 对
B. 错