符“A”的ASCII值为41H，因此字符“E”的ASCII值为______，前面加上偶校验位后的代码为______H 。
参考答案：45H C5
With no one to in such a frightening situation, she felt very helpless. [ ]
A. turn to
B. turn on
C. turn off
D. tum over
下列化学方程式的书写不正确的是[ ]
A．CaCO3CaO+CO2↑
B．2KMnO4K2MnO4+MnO2+O2↑
C．2Fe+6HCl=2FeCl3+3H2↑
D．CO2+Ca（OH）2=CaCO3↓+H2O
CaO+CO2↑
K2MnO4+MnO2+O2↑