A:2i
B:﹣2i
C:2+i
D:﹣2+i
Look! They ____ ____ ____ happily on the playground.
把19.2g 的Cu放入足量的稀硝酸中,微热至Cu完全反应.已知:
3Cu+8HNO3(稀)=3Cu(NO3)2+2NO↑+4H2O求: