停电安装10kV杆上断路器作业，应在良好天气下进行，如遇雷电、雨雪、大风等天气不得进行作业。
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限速运行时，发站应在货物运单、票据封套、编组顺序表及货车表示牌上注明“限速XX公里”字样。
A. 正确
B. 错误
Which of the following statements is true regarding implementing a Flashback Table recovery？ （）
An SCN is never used to perform a Flashback Table recovery.
B. If a significant number of changes have been made to the table， row movement must be enabled.
C. The tablespace must be offline before performing a Flashback Table recovery.
D. Flashback Table recovery is completely dependent on the availability of undo data in the undo tablespace.
1840年鸦片战争爆发前后，中国已由十大商帮演变为晋帮、粤帮、闽帮和（）帮四强争雄的新格局。
A. 江右
B. 徽州
C. 山东
D. 宁波
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