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问题 单项选择题

为了降低符级压缩气体的温度，减少功率消耗，通常设置（）

A.过滤器

B.加热器

C.冷却器

D.分离器

答案

参考答案：C

选择题
i是虚数单位，复数
2+i
(1+i)2
等于（　　）
A．-
1
2
+i		B．-
1
2
-i		C．
1
2
+i		D．
1
2
-i
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补全对话，情景问答
搭配句子.
( )1. Where is the boy?                                    
( )2. Can I help you?                                      
( )3. How are you?                                         
( )4. Is this the library?                                 
( )5. Whose cap is it?      		A. Yes, please.                                
B. He is on the bus.                                                          
C. No, it isn't.                                 
D. It's my brother's.                          
E. Fine, thank you.  
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