明明家在学校南边，放学后明明应朝南走．______．（判断对错）

阅读理解。

     In Japan many old people don't live with their children. They have no one to talk to. Their life is very

boring. Now a new robot (机器人) comes. It has two big eyes and ears. It looks like a white teddy bear.

There are four cameras and a sensor (传感器) in the robot. It can draw planes. It can also use the

Internet (网络) to find some pictures and draw them down. It is a good friend for the old. It will help them a lot and it can chat (聊天) with them. It can answer some questions,too. Sometimes it also helps them to

find glasses. It doesn't mind listening to the same stories again and again. Lots of children also like it. They can play with it when their parents go to work.

1. In Japan many old people _____ talk with others.

A. usually  

B. often    

C. seldom  

D. always

2. What do many old people think of their lives in Japan?

A. Busy.  

B. Boring.  

C. Interesting.  

D. Colorful.

3. What color is this new robot?

A. White.  

B. Green.  

C. Black.  

D. Brown.

4. How many cameras does the robot have?    

A. 2.  

B. 3.  

C. 4.  

D. 5.   

5. What things can't the robot do?    

A. Chat with others.   

B. Draw pictures.     

C. Use the Internet.     

D. Do housework.    

为参加毕业晚会，小敏用圆心角为120°，半径20cm的扇形纸片围成一顶圆锥形的帽子，若小敏的头围约60cm，她戴这顶帽子大小合适吗？（    ）（填“合适”或“不合适”）

深冷装置的轻烃产品比其他，如原油稳定、浅冷装置的产品更具特点，在其轻烃产品的储存、输送及生产过程中，尤其要注意防止（）的产生。

A.水和杂质

B.泄漏和静电

C.挥发

D.静电

是动作电位发生的基础（）

A．EPP

B．IPSP

C．BER

D．EPSP

已知：某汽油机的气缸数目i=6，冲程数t=4，气缸直径D=100[mm]，冲程S=115[mm]，转速n=3000[r/min]，有效功率Ne=100[kW]，每小时耗油量Gt=37[kg/h]，燃料低热值hu=44100[kJ/kg]，机械效率hm=0.83。求：平均有效压力，有效扭矩，有效燃料消耗率，有效热效率，升功率，机械损失功率，平均机械损失压力，指示功率，平均指示压力，指示燃料消耗率，指示热效率。