题目

It is a pity that his son was born ______ a weak heart． A．in               B．from                   C．with                          D．at 答案：C常温下，下列各组离子在指定溶液中能大量共存的是 A．滴加石蕊试液显红色的溶液：Al3+、Fe2+、ClO-、SO42-B．含有0.1 mol/LFe3+的溶液：K+、Mg2+、S2-、NO3- C．的溶液：K+、Fe3+、SO42-、NO3- D．水电离的c(H+)=10-12 mol/L的溶液：Mg2+、NH4+、HCO3-、Cl-