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．power

B．authorized

C．accredit

D．unauthorized

百分表的最小精确读数值是（）毫米。

A、0.1；

B、0.01；

C、0.001；

D、1.