A：Fe（OH）2 + 2HCl ='==' FeCl2 + 2H2O
B：NaOH + HCl='==' NaCl+ H2O
C：Ba（OH）2 + H2SO4 ='==' BaSO4 ↓ + 2 H2O
D：2HCl + Cu（OH）2 ='=' CuCl2 + 2H2O
— Are those shoes yours?
— No, they aren't.
— Whose shoes are they, ?
— They are Tom's.
微量元素是指在人体内总量不到万分之一的20多种元素，这些元素对人体正常代谢和健康起着重要作用，下列元素不是微量元素是（ ）
