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问题 单项选择题

在以招标方式订立合同时，下列行为中属于承诺性质的是( )。

A．招标

B．投标

C．开标

D．发出中标通知书

答案

参考答案：D

解析： 按照《合同法》的规定，发出招标公告和投标邀请书是要约邀请，递交投标文件是要约，发出中标通知书是承诺。

单项选择题

Certificates are （） documents attesting to the （） of a public key to an individual or other entity. They allow verification of the claim that a given public key does in fact belong to a given individual. Certificates help prevent someone from using a phony key to （） someone else. In their simplest form, Certificates contain a public key and a name. As commonly used, a Certificate also contains an （） date, the name of the CA that issued the Certificate, a serial number, and perhaps other information. Most importantly, it contains the digital （） of the certificate issuer. The most widely accepted format for certificates is X.509, thus, Certificates can be read or written by any application complying with X.509.

Most importantly, it contains the digital （） of the certificate issuer.

A．signature

B．mark

C．stamp

D．hypertext
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问答题 简答题

如果系统内油液较脏，需要更换，如何更换液压油？
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