问题 问答题 简答题

为什么要对挤出机的料筒和螺杆进行冷却?

答案

参考答案:

在挤出过程中经常会产生螺杆回转生成的摩擦剪切热比无聊所需的热量多的现象,这会使料桶内物料温度过高。这些热量如不及时排出,就会引起物料分解,甚至使成型难以进行。二者这样也可以提高固体的输送率,和制品的质量。

改错题

改错部分。

下列各句A、B、C、D四处均有一处错误,请指出并改正。

1. He had looked forward to meet her all day and now he was alone with his roses, and

            A           B                        C

    chocolates, like a fool.                                              ________________

                            D

2. Find that Zhin was heart-broken, he grandmother finally decided to let the couple cross

          A                               B                                                                               C

    the Milky Way to meet once a year.                                   ________________

                                                  D

3. He could not have Yong Hui getting away with tell people lies.             ________________

             A                                             B               C           D

4. Their balance diets became such a success that before long Wang Peng became slimmer

                       A                                B                        C

    and Yong Hui put on more weight.                                   _________________

                                        D

5. Yes, the fact is that I earned my passage by working as an unpaid hand, that accounts for

                                                                         A                    B                  C         D

       my appearance.                                                 __________________

6. At this moment, they see a penniless young man to wander on the pavement outside their

        A                              B                                        C                 D

    house.                                                                           

7. Just have you sit here is a great honor! As for the bill, sir, please forget it.  

            A                                    B              C                                  D  

                                                                                   

8. The earth became so violent that it was not clear that the shape would last or not.  

                          A                      B                            C                                     D

__________________

9. Walking does need a bit practice now that gravity has changed.          

                         A           B      C         D                                                 

10. Last month I was luck enough to have a chance to make a trip into space with my friend

                                           A                         B                      C         D

Li Yanping, an astronomer.                                        _________________

问答题 简答题