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问题 选择题
3A的直流电通过电阻R时，t时间内产生的热量为Q；现让一交流电通过电阻R，若2t时间内产生的热量为Q，则该交流电流的有效值和最大值分别为（　　）

A．I有=3/2A，Im=3A

B．I有=3A，I有=3A

C．I有= A，I有 A

D．I有3A，Im=6A

答案

答案：A

写作题
书面表达 （15 分）
(A)按下列表格填空，至少5句。（5分）
Good Habit
Bad Habit
get up early
keep long fingernails
 
 
 
 
 
 
 (B)请根据上面表格提示以How to Keep Healthy为题写一篇80词左右的短文。（10分）
                                                                                           
                                                                                   
                                                                                   
                                                                                 
                                                                                 
                                                                                  
                                                                                   
                                                                                  
                                                                                
                                                                                  
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选择题

等差数列{an}中，a6=2，S5=30，则S8=（　　）

A．31

B．32

C．33

D．34
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