问题 问答题 简答题

简述数控冲压的特点。

答案

参考答案:

1、冲床的通用性高,在不更换模具的情况下,可以生产多种冲压件

2、消耗能量少,产品精度高

3、可采用批量生产模式,安装调试模具时间短,模具寿命长,提高了的生产效率

4、数控冲压特别适合单件小批量生产,降低了冲压件的成本

5、数控冲压设备投资较大,材料利用率较低

改错题

此题要求改正所给短文的错误。对标有题号的每一行做出判断:如无错误,在答题卡该行右边横线上划一个勾(√);如有错误(每行只有一个错误),则按下列情况改正:

该行多一个词:把多余的词用斜线(\)划掉,在答题卡该行右边横线上写出该词,并也用斜线划掉。

该行缺一个词:在缺词处加一个漏字符号(∧),在答题卡该行右边横线上写出该加的词。

该行错一个词:在错的词下划一横线,在答题卡该行右边横线上写出改正后的词。

Time seem limited for us Senior Three students.            76_________

Therefore, more and more student are studying from early             77_________

morning till lately afternoon, even during the ten-minute               78_________

break. In my opinion, Take a break between classes is                  79_________

not necessary. Otherwise, we will feel tired both physically        80_________

and mentally. During the break, we should do something          81_________

to get rid of tiredness. What they need is to have a real rest,             82_________

instead getting more tired. My break is always pleasing.                83_________

Sometimes I take some simple exercise. Sometimes I had a free    84_________

chat with my classmates or just take a walk outside. While the           85_________

next class begins, I feel fresh again.

单项选择题