在下列各种编码中，每个字节最高位均是“1”的是（）。A. 外码B. 汉字机内码C. 汉字国际码D. ASC

A、开启回收系统

B、关闭回收系统

C、程序结束

A、M115

B、M119

C、M120

D、M121

A、M115

B、M119

C、M120

D、M121

A、开启回收系统

B、关闭回收系统

C、程序结束

A、乙炔

B、丙酮

C、氮气

us (in that order), but does not include the password parameter. You attempt to log in to the device, but the network containing the authentication servers is currently down.Which statement is true about your login attempt？（）

A. The login attempt is rejected.

B. The login attempt is automatically accepted after the authentication servers’ timeout value is reached, since there are no other authentication methods available.

C. The M120 automatically tries authenticating locally on the device after the authentication servers’ timeout value is reached.

D. The M120 automatically tries authenticating locally on the device before using external authentication.

A、放掉

B、应通过回收系统进行回收

C、不处理