电击伤害，按电流通过人体时的生理机能反应和对人体的伤害程度，电流分类不包括（）。
A.感知电流
B.持续电流
C.致命电流
D.摆脱电流
参考答案：B
The Indian Ocean tsunami at the end of 2004 is believed _____ more than 160,000 people and made millions homeless, _______ it perhaps the most destroying tsunami in history.
A．to kill; making
B．to have killed; making
C．having killed; to make
D．killing; made
模拟信号传输的缺点有（）。
A、抗干扰能力差
B、信号太强
C、信号衰减大
D、信号容易失真
