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问题 不定项选择

存在“费用高；维护困难；系统维护需要开发单位的长期支持”等缺陷的企业IT项目建设模式是（）。

A．自主开发方式 

B．委托开发方式 

C.联合开发方式 

D．购置软件包

答案

参考答案：B

单项选择题 A1/A2型题

正常青少年及成年人通常出现REM睡眠在入睡后（）。

A.30min以内

B.30～60min

C.60～90min

D.90～120min

E.120～150min
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单项选择题

In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the answer sheet. There are two types of key technology: private key and public key. Private-key encryption methods are called (71) ciphers, information is encrypted with (72) both the sender and receiver hold privately. Public-key encryption methods are called (73) ciphers, (74) created for each user, encryption key and decryption key are (75)

A．same

B．different

C．difference

D．some
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