39.下列化合物熔點高低順序,何者正確?
(A)CaO>MgO>KF>NaF
(B)MgO>CaO>NaF>KF
(C)NaF>KF>MgO>CaO
(D)KF>NaF>CaO>MgO
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統計: A(33), B(86), C(25), D(11), E(0) #1343756
統計: A(33), B(86), C(25), D(11), E(0) #1343756