就辐射量而言,网上两派都有。

到底哪种好呢?

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                    ,,,,,,,,,,,,,,,                              

          ,,,mmbbbbbb11111111111111111111111bbbbbmm,,,                

   ,,,b||PPPPPPP||````````````````|PPPPPPPPP111111111111bbm,,         

 ``````                                     ‘````PPPP111111111bm,     

                                                     ```PP1111111bm,  

                                                          `PP111111b, 

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