下列物质在水溶液中的电离方程式错误的是( )
A:NaHCO3═Na++H++CO32﹣
B:NaHSO4═Na++H++SO42﹣
C:MgCl2═Mg2++2Cl﹣
D:Ba(OH)2═Ba2++2OH﹣
x÷2.6=0.35
x=____
3个 518 是____ ?
I've had ______ bad cold, so I don't think I can go to ______ school today.