下列物质水溶液经加热浓缩、蒸干、灼烧后不能得到原物质的是
①NH4HCO3； ②CaCl2； ③AlCl3； ④Cu(NO3)2； ⑤FeCl2；⑥K2SO3； ⑦KMnO4； ⑧KAl(SO4)2。
| A．①②③⑤ | B．①③④⑤⑥⑦ | C．①③④⑤ | D．以上均不能 |
相关试题
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 can’t leave. She told me that I ______ stay here until she comes back.
| A．can | B．must | C．will | D．may |
—— Do you mind my opening the window? It’s a bit hot in here.
—— ______ , as a matter of fact
| A．Go ahead | B．Yes, my pleasure |
C．Yes, I do | D．Come on |
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