রেফারেন্স পুস্তিকা

Table Of Contents
E
3
    (  p )
n 
4       
   s s 
    , 
 
       
     ,  

  
,   p   p 
t   s    

        
   15  (W  (180°) )
 30  (X  (360°) )   ,
  
B     
      -  -    
    d ,  m      
    ,    , - k  
            
            ,
       
