下列不需要负责人或当事人承担责任风险的事故是（）。
A. 天然气井喷导致员工死亡
B. 游客在公园被害
C. 同事搭自己的车回家，中途遇车祸重伤
D. 驴友相邀自助游，一女孩因煤气中毒遇难
查看答案
多通道协议包含一个控制通道和若干其它控制或数据通道，即控制信息的交互和数据的传送是在不同的通道上完成的，例如FTP和HTTP。（）
A. 正确
B. 错误
最早的标注语言是（）
A. XML
B. HTML
C. VRML
D. SGML
You have enabled backup optimization in RMAN. You issue the following RMAN command to configure a redundancy-based retention policy： CONFIGURE RETENTION POLICY TO REDUNDANCY 3； Which statement is true？（）
A. The command fails because you cannot configure a redundancy-based retention policy when backup optimization is enabled
Backup optimization is performed， but RMAN considers the redundancy-based retention policy when it determines which datafiles should be backed up
C. Backup optimization is permanently disabled
D. Backup optimization is temporarily disabled because a redundancy-based retention policy is specified
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