16、(20分)Ⅰ.(每空2分,共8分)

1)­­________     ________   2)________     ________________________

Ⅱ.(实验步骤5分,实验预期及结果分析7分,共12分)

(三)实验步骤:

第二步:                                 

第三步:                                                       

第四步:                                                     

(四)分析预期的实验结果

实验预期:A试管                                                

                                                                。B试管                                                    

                                                              

结果分析:A试管                                                 

                                                               

B试管                                                   

                                                             

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