问题 问答题 论述题

论述YJ17烟支重量发生偏差时的控制过程。

答案

参考答案:

SRM控制系统把接收的烟条密度信号转换成烟条平均重量信号并与设定烟支重量信号比较后,如有偏差,就发出信号给平准器伺服电机,平准器伺服电机通过调节螺杆使平准器绕回转轴作微量转动。如果超重,平准器伺服电机正转,使平准器上升,减少烟丝束中的烟丝量;反之平准器伺服电机反转,使平准器下降,增加烟丝束中的烟丝量,使符合设定重量的烟丝束进入到卷制成形系统的烟枪中。烟支重量低于设定值下限,会被认为是过轻烟支;烟支重量高于设定值上限,会被认为是超重烟支,这两种烟支被SRM系统跟踪,在接装机剔除鼓轮处将其剔除。当机器停止时,平准器将自动调节到设定的启动位置。

阅读理解

Mr. Lewis was a dance teacher. He was a nice man and always had a lot of students. One year he moved to a new town, and was soon teaching many students in the dance school there, but he decided to move again to a big city. He would have more work there.

When one of his students heard that he was going to leave, she said to him, “The new teacher won’t be as good as you are.” Mr. Lewis was happy when he heard this, but he said, “Oh no. I’m sure he’ll be as good as I am ---- or even better.”

The student said, “No. Including you, five teachers have come and gone while I’ve been here, and each new one was worse than the last.”

1. ______ came to learn dancing from Mr. Lewis.

A. A few students  B. Few students  C. Many students  D. No students

2. Mr. Lewis wanted to move a big city because _______

A.   he hated the small town

B.   he couldn’t make a living in the small town

C.   it would be easy for him to have more work in the city

D.  it made him spend more money in the town

3. The student thought that _______

A.   Mr. Lewis was a good teacher     B. Mr. Lewis was the best teacher

C. Mr. Lewis was worse than the last

D. Mr. Lewis would be worse than the last

4. Before Mr. Lewis ______ teachers came to the town to teach dancing

A. three          B. four           C. five           D. six

5. From the story we can conclude(推论) that the student wished _____

A. to have a better teacher            B. to have a worse teacher

C. to become a dance teacher          D. to see the sixth teacher

单项选择题 A1型题