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问题 单项选择题

运动单位是指（）

A.一个运动神经元

B.一组具有相同功能的运动神经元群

C.一组可产生某一动作的肌肉群

D.一束肌纤维

E.由一个α运动神经元及其所支配的全部肌纤维所组成的功能单位

答案

参考答案：E

阅读理解

One day, Mr. Green and his little son were going home. At this age, the boy was interested in all kinds of things and was always asking questions. Now, he asked, “What’s the meaning of the word ‘Drunk’, dad?” “Well, my son,” his father replied, “Look, there are standing two policemen. If I think of the two policemen as four, then I am drunk.”
“But, dad,” the boy said, “ there’s only ONE policeman!”
The bus is very crowded. A man tries to get on, but no one gives a way to him.
“Hey, let me get on the bus.” the man shouts.
“It’s too crowded. You’d better take the next bus.” a passenger says to him.
“But you can’t go without me. I’m the __________.” the man says.
Mr. Black was hit by a car in the street. He was brought to the hospital. His wife who was standing up by his bed said to the doctor, “I think that he is badly hurt.” “I am afraid that he is dead.” said the doctor. Hearing this, Mr. Black moved his head and said, “I’m not dead. I’m still alive.” “Be quiet.” said the wife, “The doctor knows better than you!”
小题1:Which is the right word to fill the blank in the second passage?
A．driverB．teacherC．doctorD．singer
小题2:Which of the following is TRUE according to the passages?
A．There are only a few passengers on the bus.
B．Mr. Green had drunk a lot before going home.
C．Mr. Black lost his life because of a car accident.
D．Mr. Green and his son saw two policemen on their way home.
小题3:In which part of a newspaper can you most probably read the three passages?
A．AdvertisementB．Found and Lost
C．Latest NewsD．Fun Time
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问答题 简答题

切削时刀具磨损快甚至易断刀，这材料可能存在什么的问题？可采用什么热处理方法解决？
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