中枢神经系统即使所接触的电流小于________，已可引起神经传导阻断；如果累及________，呼吸、心跳迅速停止。
参考答案：100mA、脑干
计算机犯罪的手段有（）。
A.数据泄露
B.盗窃身份
C.破坏设备
D.破解用户密码
Password is a secret series of (69) that enables a user to access a file, computer, or program. On multi-user systems, each user must enter his or her password before the computer will respond to (70) . The password helps ensure that (71) users do not access the computer. In addition, data files and programs may require a password.
A．symbol
B．sign
C．characters
D．characteristic
