下列电离方程式不正确的是 (    )                                                                    

A．CaCl2 = Ca^2++ 2Cl^-	B．NaHSO4 = Na^++ H^++ SO4^2-
C．HNO3 = H^+ + NO3^-	D．KHCO3 = K^+ + H^+ + CO3^2-