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(一)
南方电子电气有限公司(建设单位)新建液晶屏(LCD)生产车间，其生产线由建设单位从国外订购，A施工单位承包安装。A施工单位进场时，生产车间的土建工程和机电配套工程(B施工单位承建)已基本完工。A施工单位按合同工期要求，与建设单位、生产线供应商和B施工单位洽谈，编制了LCD生产线安装网络计划工作逻辑关系及工作持续时间表(见表2-1)。

表2-1 LCD生产线安装网络计划工作逻辑关系及持续时间
工作内容工作代号紧前工作持续时间/d
进场施工准备A20
开工后生产线进场B60
基础检测验收CA10
配电装置及线路安装DA30
LCD生产线组装固定EBC75
配套设备及电气控制系统安装FBC40
LCD生产线试车调整GDE30
电气控制系统测试HDEF25
联动调试、试运行、验收IGH15
A施工单位在设备基础检验时，发现少量基础与安装施工图不符，B施工单位进行了整改，重新浇捣了混凝土基础，经检验合格，但影响了工期，使基础检验持续时间为30d。
LCD生产线的安装正值夏季，由于台风影响航运，使LCD生产线设备到达安装现场比计划晚7d。A施工单位按照建设单位的要求，调整进度计划，仍按合同规定的工期完成。
问题

分析影响工期的关键工作是哪几个总工期需多少天

答案

参考答案：

解析：影响工期的关键工作：生产线进场，生产线组装固定，生产线试车调整，联动调试、试运行、验收，总工期为180d。

解答题
已知向量
a
=(sinx，
3
2
)，
b
=(cosx，-1)
（1）当
a
∥
b
时，求2cos2x-sin2x的值；
（2）求f(x)=(
a
+
b
)•
b
在[-
π
2
，0]上的值域．
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阅读理解
完型填空。
     The earth is our home. We must take care of it. Life today is easier that it was   1   years ago, but it
has brought some new problems. One of the biggest problems is pollution. We can see it, drink it and
even hear it.
     Man has polluted the   2  . The more people, the more pollution. Many years ago, the problem was not
so serious because there were not so   3   people. When the land was used up (用光) or the river was not
clean in a place, man went to   4   place. Now man is slowly polluting the whole world. 
       5   pollution is still the most serious, it's bad for   6   thing in the world.
     Many countries don't let people burn (燃烧)   7   for air in houses and factories in the city. Pollution by
SO2 is now the most dangerous kind of air pollution. It's   8   to ride bikes. When you are tiding, there is no
pollution. But even in developed countries, most people don't go to work by bike. It's not because bikes are
expensive or people are tired if they ride to work. It's because the number of cars on the roads becomes
larger. So more people   9   their bikes and go to work by car, then things are getting worse and worse. We
should have special roads only for bikes and make it  10  difficult and expensive for drivers to take their cars
into the city that they will go back to using their bikes.
( )1. A. hundred     
( )2. A. moon        
( )3. A. lot         
( )4. A. other       
( )5. A. Air         
( )6. A. life        
( )7. A. something bad 
( )8. A. least       
( )9. A. put on      
( )10. A. quite       		B. hundreds of      
B. star             
B. little           
B. the others       
B. Food             
B. live             
B. bad something    
B. best             
B. look at          
B. such            		C. hundred of   
C. earth        
C. many         
C. the other    
C. Water        
C. living       
C. something good  
C. most         
C. put away     
C. very          		D. hundreds        
D. sun              
D. much             
D. another          
D. Native           
D. lives            
D. good something            
D. worst            
D. look up          
D. so               
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