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问题 解答题

爸爸工作作很忙，有时连续几天都不回家，偶尔回来，第一件事就是撕下外出这几天的日历．有一次回家，他撕下的日历的日期数相加正好是115．爸爸共外出______天，回来这一天是______号．

答案

115=5×23，

根据题干分析可得，爸爸外出5天，则这五天的平均数是23，所以这五天分别是21，22，23，24，25，回来这天是25号，

答：爸爸外出5天，回来这天是25号．

故答案为：5；25．

单项选择题

Public Key Infrastructure (PKI) service providers offer organizations fully integrated PKI-managed services designed to secure Intranet, Extranet, Virtual Private Network (VPN), and e-commerce applications. PKI solutions can enable a number of security services, including p authentication and non-repudiation of transactions.
eToken enables the users of PKI systems to generate and store (101) and digital certificates inside the token, creating a secure environment and allowing full portability and maximum ease of use. eToken Pro can also perform sensitive on-chip (102) operations, ensuring that users’ keys axe never exposed to the PC environment, eToken eliminates the need to store (103) and keys on a hard disk or browser file, or to transmit them across the Internet/Extranet; assuring peace-of-mind and confidence during online communications.
A digital signature is created using the private key of an individual to ensure the Validity of his request. This technology can be used to guarantee (104) of various transactions. The strength of either the authentication level or the digital signature relies on the level of protection offered to the private key. eToken Pro offers the maximum level of security, since it enables the use of the private key for signing and authenticating inside the eToken.
The most secure use of authentication involves enclosing at least one certificate with every signed message. The message (105) verifies the certificate using the CA’s public key. If the sender’s public key is legitimate, the recipient verifies the message’s signature. Digital signatures created with a private key are verified with the digital certificate containing the public key.

A．conformance

B．conference

C．non-repudiation

D．secrecy
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判断题

来在界区的氮气一部分经加热后可作为再生用热氮。
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