题目

下列离子方程式书写正确的是 A．将铁屑加入Fe3+溶液中：2Fe3++Fe===3Fe2+ B．过氧化钠固体与水反应：2O22—＋2H2O ＝ 4 OH—＋ O2↑  C．NH4HCO3溶液与过量的NaOH溶液反应：NH4+ +OH—＝ NH3↑+ H2O D．将氯化亚铁溶液和稀硝酸混合： 答案：AHaving received ________ training of the MS. Company, he was offered ________ important position in management.A.the; anB.不填; anC.the; 不填D.a; a