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période et masse cumulé


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svp je veut une explication claire pour les notions suivant :

* la période  

*la masse cumulé (la somme des masses modales effectives) 

et comment influent la disposition et les dimensions des voiles sur ces deux point important 

je serai très reconnaissant si vous me répond :blink:  :blink:  :blink:  :blink:



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