下列各组中的离子，能在溶液中大量共存的是
| A．Na+、Mg2+、SO42－、Cl |
| B．Na+、Ca2+、CO32－、NO3－ |
| C．Na+、H+、Cl－、CO32－ |
| D．K+、Fe3+、SO42－、OH- |
相关试题
Progress______ so far very good and we are sure that the work will be finished on time.
| A．was | B．had been | C．has been | D．will be |
Charles was alone at home, with_______ looking after him.
| A．someone | B．anyone | C．not one | D．no one |
It is often ______ that human beings are naturally equipped to speak.
| A．said | B．to say | C．saying | D．being said |
I’m sure that your letter will get______ attention. They know you’re waiting for the reply. 
| A．continued | B．immediate | C．careful | D．general |
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