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选择I will be doing 或 I will have done填空。 A: Can we meet tomorrow? B:Yes, but not in the afternoon. I __________ (work) at that time.

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选择I will be doing 或 I will have done填空。 Lisa is from New Zealand. She is travelling around Europe at the moment. So far she has travelled about 1,000 miles. By the end of the trip, she _______(travel) more than 3,000 miles.

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10. 包过滤型防火墙过滤数据包的依据有哪些?

2.什么是用户认证?什么是数字签名?它们各适用于什么场合?

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