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47. Which of the following is one of the basic characteristics of DRAMs?
  
(a)   DRAMs must have a constantly changing input.
 
(b)   DRAMs must be periodically refreshed in order to be able to retain data.
 
(c)   DRAMs have a broader “dynamic” storage range than other types of memories.
 
(d)   DRAMs are simpler devices than other types of memories.  
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