A:CH3COOH+OH﹣═CH3COO﹣+H2O
B:H++OH﹣═H2O
C:CH3COOH+OH﹣+Na+═CH3COONa+H2O
D:CH3COOH+NaOH═CH3COO﹣+Na++H2O
已知a→=(2,﹣1,3),b→=(﹣4,2,x),且a→⊥b→,则x=( )