题目

下列各组离子能在溶液中大量共存的是（   ）。 A．H＋、Ca2＋、CO、Cl－  B．K＋、Na＋、OH－、Cl－  C．Mg2＋、Na＋、OH－、SO D．Mg2＋、Ba2＋、Cl－、SO 答案：B Which proverb means “If you want to do difficult things successfully, you should work with others together”．A．Don’t let yesterday use up too much of today．B．One finger cannot lift a small stone.C．You can’t wake a person who is pretending to be asleep.D．Be careful of the dog that does not bark.