通信的不可抵赖、不可否认安全要求即是能建立有效的责任机制，防止（）否认其行为
患者男性，35岁，出现局部隆起，红肿热痛明显，压之剧痛，有波动感，应首先考虑为()
A. 丹毒
B. 蜂窝织炎
C. 脓肿
D. 疥
E. 痈
井下为什么不能随意调整安全阀的整定压力？安全阀开启压力的检查周期为多长时间？
Which step do you need to perform to enable a user with the SYSDBA privilege to log in as SYSDBA in iSQL*Plus？（）
A. The user must be granted the database administrator （DBA） privilege.
B. The user must be listed in the password file for the authentication.
C. No special setup is needed for the user to connect as SYSDBA in iSQL*Plus.
D. Set up a user in the Oracle Application Server Containers for J2EE （OC4J） user manager，and grant the webDba role to the user.
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