普通股没有还本要求，股息也不固定，因而不存在信用风险。
参考答案：错
Harry _______ in this school since he came to China. [ ]
A. is working
B. was working
C. will work
D. has worked
下列反应属于复分解反应的是（ ）
A．Fe+2HCl═FeCl2+H2↑
B．2 KMnO4═K2MnO4+MnO2+O2 ↑
C．CaO+H2O═Ca（OH）2
D．Ca（OH）2+K2CO3═CaCO3↓+2KOH
