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简述剪彩仪式的礼仪规则。

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当无线调车灯显设备故障时，应立即停止（）。

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对入网机构12个月内首次出现各类违规，中国银联将采取以下约束性措施（）。

A. 发送提示函
B. 限期纠正
C. 警告
D. 停止交易

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更换发动机风扇皮带时，可单独更换其中磨损的一根，而不必成组更换。

A. 正确
B. 错误

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You want the ability to recovery any time within the last seven days and therefore you configured the recovery window retention policy using the command： RMAN> CONFIGURE RETENTIOH POLICY TO RKCOVFRY WINDOW OF 7 DAYS； After configuring the recovery window， you performed the database backup as follows：（）

A. Backup RB1 at log sequence number 12871 on 5th Jan
Backup RB2 at log sequence number 15622 on 12th Jan
C. Backup RB3 at log sequence 16721 on 15th Jan
D. On 20th Jan when the log sequence number was 18112 you realize that there Is a need to a point in time at the beginning of the recovery window. You have all an hived redo log files to date.

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