题目

 Building a new school is one thing, while keeping it running smoothly is quite_______. A. the other    B. another    C. neither    D. others 答案：B下列离子组能在PH=1的溶液中大量共存的是A、NO3- Fe3+ Na+ OH- B、K+ SO42- Na+ NO3-C、Cl- K+ SO42+ Ba2- D、Ca2+ Cl- CO32- Na+