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【单选题】
在(19)中， ①用于防止信息抵赖； ②用于防止信息被窃取； ③用于防止信息被篡改； ④用于防止信息被假冒。A.
①加密技术②数字签名③完整性技术④认证技术
B.
①完整性技术②认证技术③加密技术④数字签名
C.
①数字签名②完整性技术③认证技术④加密技术
D.
①数字签名②加密技术③完整性技术④认证技术
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【简答题】Passage Study the following before listening. vitamin n. 维生素,维他命 contain v. 包含,包括 deficiency n. 缺少,缺乏 essential adj. 基本的,必要的 well-balanced ...
【简答题】A．A computer student at the university. B．A computer artist. C．A famous artist. D．The director of the new computer museum.
【简答题】“对齐”命令的快捷键是
【单选题】The author refers to an artist and a doctor______.
A.
because an artist can make a picture and a doctor can hear sick pulse
B.
in order to make people know how a teacher feels when he succeeds in creating a human being
C.
because both the artist and the doctor were once students
D.
in order to show the fact that students can become good doctors and artists
【简答题】He is more an artist than a singer．（改为同义句） He is an artist_________ _________a singer．
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