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如图,CD=CA,∠1=∠2,EC=BC.求证:DE=AB.

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CA及CDCA浓度增加且CA/CDCA>1  CA及CDCA浓度增加且CA/CDCA<1  CA及CDCA浓度减少且CA/CDCA>1  CA及CDCA浓度减少且CA/CDCA<1  CA及CDCA成比例增加  
CA和CDCA浓度增加,但以CDCA为主,CA/CDCA<1  CA和CDCA浓度增加,但以CA为主,CA/CDCA>1  CA和CDCA浓度增加,但以CA为主,CA/CDCA<1  CA和CDCA浓度增加,但以CDCA为主,CA/CDCA>1  CA和CDCA浓度减少,但以CDCA为主,CA/CDCA>1  
-2  2               
CA和CDCA浓度增加,但以CDCA为主,CA/CDCA<1  CA和CDCA浓度增加,但以CA为主,CA/CDCA>1  CA和CDCA浓度增加,但以CA为主,CA/CDCA<1  CA和CDCA浓度增加,但以CDCA为主,CA/CDCA>1  CA和CDCA浓度减少,但以CDCA为主,CA/CDCA>1  
-2     2              
CA和CDCA浓度增加,但以CA为主,CA/CDCA>1  CA和CDCA浓度增加,但以CA为主,CA/CDCA<1  CA和CDCA浓度增加,但以CDCA为主,CA/CDCA<1  CA和CDCA浓度增加,但以CDCA为主,CA/CDCA>1  CA和CDCA浓度减少,但以CDCA为主,CA/CDCA>1  
CA及CDCA浓度增加且CA/CDCA>1  CA及CDCA浓度增且CA/CDCA<1  CA及CDCA浓度减少且CA/CDCA>1  CA及CDCA浓度减少且CA/CDCA<1  CA及CDCA成比例增加  
B.为一条电场线上的两点,以下说法正确的是 ( ) A.EA与EB一定不等,一定不等   EA与EB可能相等,可能相等   EA与EB一定不等,可能相等   EA与EB可能相等,一定不等   
CA及CDCA浓度增加且CA/CDCA>1  CA及CDCA浓度增加且CA/CDCA<1  CA及CDCA浓度减少且CA/CDCA>1  CA及CDCA浓度减少且CA/CDCA<1  CA及CDCA成比例增加  
CA和CDCA浓度增加,但以CDCA为主,CA/CDCA<1  CA和CDCA浓度增加,但以CA为主,CA/CDCA>1  CA和CDCA浓度增加,但以CA为主,CA/CDCA<1  CA和CDCA浓度增加,但以CDCA为主,CA/CDCA>1  CA和CDCA浓度减低,但以CDCA为主,CA/CDCA>1  
CA及CDCA浓度增加且CA/CDCA>1  CA及CDCA浓度增加且CA/CDCA<1  CA及CDCA浓度减少且CA/CDCA>1  CA及CDCA浓度减少且CA/CDCA<1  CA及CDCA成比例增加  
TBA正常,CA/CDCA>1  TBA升高,CA/CDCA<1  TBA升高,CA/CDCA>1  TBA降低,CA/CDCA<1  TBA降低,CA/CDCA>1  
CA和CDCA浓度增加,但以CDCA为主,CA/CDCA<1  CA和CDCA浓度增加,但以CA为主,CA/CDCA>1  CA和CDCA浓度增加,但以CA为主,CA/CDCA<1  CA和CDCA浓度增加,但以CDCA为主,CA/CDCA>1  CA和CDCA浓度减少,但以CDCA为主,CA/CDCA>1  
TBA正常,CA/CDCA>1  TBA升高,CA/CDCA<1  TBA升高,CA/CDCA>1  TBA降低,CA/CDCA<1  TBA降低,CA/CDCA>1  

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