常温下，下列各组离子在指定溶液中一定能大量共存的是
| A．0.2 mol·L-1的CaCl2溶液：Na＋、K＋、Cl－、CO32- |
| B．0.2 mol·L-1的KNO3溶液：H+、Fe2+、Cl－、SO42－ |
| C．0.2mol·L-1的HNO3溶液： Na＋、NH4＋、Cl－、CO32- |
| D．使甲基橙变红色的溶液：NH4+、Cu2+、SO42－、Cl－ |
相关试题
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 |
All the dishes in this menu, ______ otherwise stated, will serve two to three people. 
| A．as | B．if | C．though | D．unless |
The children loved their day trip, and they enjoyed the horse ride ______.
| A．most | B．more | C．less | D．little |
I can’t leave. She told me that I ______ stay here until she comes back.
| A．can | B．must | C．will | D．may |
—— ______ , as a matter of fact
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