邮政职业道德是邮政行业贯彻“人民邮政为人民”服务宗旨和实现邮政通信生产()服务方针的道德保证。(1分)
A.迅速
B.准确
C.安全
D.方便
参考答案:A, B, C, D
The lack of evidence and witness led to____. [ ]
A. the appeal having rejected
B. reject the appeal
C. the appeal being rejected
D. the appeal to be rejected
简述数据库恢复机制所涉及的两个关键问题。