由于个人缴费基数差异较大，影响养老金水平，如何处理？

At the end of every RUN block.
B. After every SET CONTROLFILE AUTOBACKUP FORMAT command.
C. After every BACKUP or COPY command issued at the RMAN prompt.
D. At the end of every RUN block if the last command in the block was either BACKUP or COP
E. Whenever a BACKUP or COPY command within a RUN block is followed by a command that is neither BACKUP nor COP
F. After every BACKUP or COPY command within a RUN block that is followed by the CONFIGURE CONTROLFILE AUTOBACKUP FORMAT command.

A. 清澈透明
B. 初时极少量气泡，后没有气泡
C. 持续大量气泡
D. 初时极少量气泡，后气泡增多