常见的机架型式有开口式、闭口式、()。
A.横列式
B.连续式
C.半闭口式
参考答案:C
—Have you him to give up the job?
—Yes,I have. But he doesn’t listen to me.
A.persuaded
B.suggested
C.agreed
D.advised
齿轮在投影为圆的视图上,规定画法是齿顶圆为()
A.粗实线
B.细实线
C.点划线