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单项选择题

一个密码体制是一个六元组，即：明文、密文、（）、加密变换、（）和解密变换

A.加密算法
B．加密密钥
C．解密算法
D．解密密钥
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单项选择题
下列各项操作中，不符合安全用电原则的是（）
A.更换电灯泡时，要断开电源开关
B．使用验电笔时，手要接触验电笔后端的金属部分
C．在家庭电路的前端安装空气开关
D．电器电线绝缘皮破损了，仍然继续使用
未知题型
规划建设__，对国家长治久安和西藏经济社会发展具有重大而深远的意义，一定把这件大事办成办好
未知题型
Hi, long time no see, where have you been hiding? Answer:___________________________________________. How is life treating you? Answer:___________________________________________. Oh, I almost forgot. I heard you got a new boyfriend/ girlfriend. What is he/she like? Answer: ___________________________________________. I’d like to see you two together sometime. Answer:___________________________________________. Where are you heading? I’m asking because I saw those shopping bags in your hand. Going back home from shopping? Answer:___________________________________________. Too bad, what’s wrong with the shirt? Answer:___________________________________________. Where did you buy it? Answer:___________________________________________. What are the return policies like? Can you get a full refund? Answer:___________________________________________. I really feel sorry. You’d better hurry up. The mall is closing in an hour. Answer:___________________________________________. See you soon. Answer:___________________________________________.
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