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坝体分缝按其作用

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发电机由水轮机、汽轮机、柴油机、汽油机或其他动力机械驱动，将水流、气流、燃料燃烧或原子核裂变产生的能量直接传给发电机，由发电机转换为电能。

A. 正确
B. 错误

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简述现代餐饮营销的特点。

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模式生物的共性特征有哪些？

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View the Exhibit to examine the output of the DBA_OUTSTANDING_ALERTS view. After 30 minutes， you executed the following command： SQL> SELECT reason，metric_value FROM dba_outstanding_alerts； REASON METRIC_VALUE ------------------------------------------------------------ ------------ Tablespace [TEST] is [28 percent]full 28.125 What could be the reason for the elimination of the other rows in the output（）

An Automatic Workload Repository snapshot has been taken recently.
B. The non-threshold-based alerts are transferred to DBA_ALERT_HISTOR
C. The threshold alerts conditions are cleared and the alerts are transferred to DBA_ALERT_HISTOR
D. The threshold alerts related to database metrics are permanently stored in DBA_ALERT_HISTORY but not the threshold alerts related to instance metrics.

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