Password is a secret series of(69)that enables a user to access a file, computer, or program. On multi-user systems, each user m

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问题 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.

选项 A、symbol
B、sign
C、characters
D、characteristic

答案D

解析 本题意思为“密码是一组字符串”,characteristic此处意为“字符串”。答案为D。
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