下列离子方程式书写正确的是
| A．碳酸钙溶于醋酸溶液中：CaCO3 + 2H+ = Ca2+ + CO2↑ + H2O |
| B．氯化镁溶液和氨水混合：Mg2+ + 2OH－ = Mg(OH)2 |
| C．铁与稀硝酸反应：Fe＋2H+ = Fe2+＋H2↑ |
| D．铝片插入硝酸银溶液中 Al +3Ag+ = Al3++3Ag |
相关试题
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 |
It’s high time you had your hair cut ; it’s getting _______ . 
| A．too much long | B．much too long |
C．long too much | D．too long much |
My friend showed me round the town, ______ was very kind of him. 
| A．which | B．that | C．where | D．it |
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