混合下列各组物质使之充分反应，加热蒸干产物并高温下灼烧至质量不变，最终残留固体为纯净物的是
| A．向CuSO4溶液中加入适量铁粉 |
| B．等物质的量浓度、等体积的FeCl3与KI溶液混合 |
| C．等物质的量的NaHCO3与Na2O2溶于水 |
| D．在Na2SiO3溶液中通入过量CO2气体 |
相关试题
Edward, you play so well. But I ______ you played the piano. 
| A．didn’t know | B．hadn’t known |
C．don’t know | D．haven’t known |
She brought with her three friends, none of ______ I had ever met before. 
| A．them | B．who | C．whom | D．these |
I tried phoning her office, but I couldn’t _______. 
| A．get along | B．get on | C．get to | D．get through |
His sister left home in 1998, and _______since. 
| A．had not been heard of | B．has not been heard of |
C．had not heard of | D．has not heard of |
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