题目

The skirt ______ she spent 50 yuan is very beautiful on her．   A．in which                B．on which           C．for which          D．with which 答案：B在溶液中能大量共存的一组离子或分子是（　　） A、Na+、CH3COO-、CO32-、OH-B、NH4+、H+、NO3-、HCO3-C、K+、Al3+、SO42-、CO32-D、Na+、K+、Fe2+、Cl2