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第二步:                                                  

第三步:                                                              

                                                                          

第四步:                                                                      

                                                                              

实验结果:                                                                    

                                                                              

(2)①                     

 

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39.(10分)

(1)①                                     ,

                           

 

 

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38.(6分)

(1)        

(2)          

(3)                                                  

(4)              

(5)               ,             

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37.(8分)

(1)                       

(2)             

(3)             

(4)                                               

(5)       

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36.(8分)

(1)                                                                                                         

(2)                       

__                                             __                                              

(3)                               _                  _

                                                        

(4)                                                                     (5)                                                                           

(6)                                                                                   

                                                 

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35.(8分)

   (1)                             

   (2)              

   (3)                        ,           

   (4)                   

   (5)         ,                                                   

                                                                          

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34.(5分)

(1)                    

(2)                                                          

                                                      

                                                      

(3)           

(4)                        

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33.(7分)

    (1)             

    (2)                 ,                

    (3)                                

(4)                                        

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32.(8分)

(1)                _ ;                   

(2)[  ]           [   ]           [    ]               

     [   ]             

(3)[   ]            [   ] _______        ___。

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31.(5分)

(1)                    

(2)                                          

                                           

(3)                                                

                                                    

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