正弦交流电变化过程中出现的（），称为最大值。用字母Em、Im、Um表示。
A customer has a large amount of data stored on three database servers and is concerned that at present there is no disaster recovery plan in place. They have an existing tape backup solution that meets their backup window. In order to analyze potential disaster recovery plans， which of the following questions is the most important？（） What is the minimum critical backup window？。 Which server is handling the most critical data？。 How much data is stored on each server？。 What is the throughput of the hard drives？。
龙滩水电站工程招标投标的主要特点是：形成严密、科学的招标操作程序和评标办法，实行（）和综合评标方法。 公开招标。 邀请招标。 无标底招标。 分部招标。
You previously secured your listener with an encrypted password. However， you need to set a new password for security reasons. What is the correct method for setting a new encrypted password for the listener using the Listener Control utility？（） executing the SET PASSWORD command and then the SAVE_CONFIG command。 executing the CHANGE_PASSWORD command and then the SAVE_CONFIG command。 executing the CHANGE_PASSWORD command and then the SET PASSWORD command。 executing the SET PASSWORD command， then the CHANGE_PASSWORD command and finally， the SAVE_CONFIG command。
发现问题取决于以下因素（）。 智力。 认知过程。 主体活动积极性。 主体的求知欲望。 主体的知识经验。
半导体中的载流子是电子和（）。
