题目

--- Where did he leave his car key?     --- It was in the lab        he made the experiment.        A．where      B．that   C．what  D．there 答案：A16．下列离子方程式正确的是（　　）A．铁跟盐酸的反应 Fe+2H+═Fe3++H2↑B．铁片和CuSO4溶液的反应 2Fe+3Cu2+═3Cu+2Fe3+C．钠与跟水反应  Na+H2O═Na++OH-+H2↑D．氯化铁溶液和氢氧化钠溶液的反应Fe3++3OH-═Fe（OH）3↓