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The presence of which salts in water predefines temporal hardness of water? 

А.  CaCO3 and MgCO3

B.  Mg(HCO3)2 and Ca(HCO3)2 

C.  KHCO3 and NaHCO3

D.  Na2SO4 and CaSO4

E. KHCO3 and Ca(HCO3)2 

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B.  Mg(HCO3)2 and Ca(HCO3)2

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