Unmanned bank utilizes various technologies such as ( ) A: biometrics B: speech recognition C: machine learning D: virtual reality

下列哪些属于物联网的关键技术（）？ A: wireless communication B: microcontrollers C: location technology D: biometrics

Unmanned retail technology can be divided into three genres: . A: Internet of Things B: Biometrics C: Artificial intelligence D: Internet

以下哪项服务用于在一个中心地方为多个本地设备提供认证服务，该服务不使用tokens令牌。（） A: TACACS+ B: Smartcards C: Biometrics D: Kerberos