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,    .
  
 
   ,   
    
   
,    
 .
     
   .
:    
  
  
.
    
    
   .  
     .
    
   .
    
,  
   
 ,    (.  I).
      
 ,  
.
,   , 
    .
,     
    .
 
 ,  
,    .
    
.    
   .
    
     .
     
 , , 
 
 ,   
  .
,   
    , 
   . 
 ,  
     
    .
    
  .
     ,  
      
 . ,  
,    .
     
  .   
.
    

  
 .  
   
.
Ч  ЩХ
   
Х , 
   .
   
    : 
    EN 30-1-1  
  3.
  ,  
  ,   
  .  
    , 
     
,    

 .
  ,   
  (    )
    .  
,      .
   
   .
     , 
  ,   
 ,   
,    (P. 2), 
   .
     
   
     (. 2a).
    
  
   ,     . 2b.
   , 
     .
A.  
1-   (). 
    (. 1a).
      
,     ,
     .
    ,
 .
B.    
 :
     
   .
     , 
     .  
    
.
    ,
    
(,
    
   ).
  .  . 1b.
,    ,
    90ºC.
     
    
 ,   
  (. 3).
   

,     
   (. 3a).   
    .
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