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简述烂鳃病的诊断方式。

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产业结构不合理主要是（）.

A. 供给结构的变化不能适应需求结构的变化
B. 产业集中化
C. 需求结构的变化不能适应供给结构的变化
D. C都是

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餐饮消费类型包括哪些？

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脱氢气液分离罐的内部结构是怎样的？

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You are using flat files as the data source for one of your data warehousing applications. To optimize the application performance， you plan to move the data from the flat files to clustered tables in an Oracle database.While migrating the data， you want to have minimal impact on the database performance and optimize the dataload operation. Which method would you use to load data into the Oracle database（）

A. Use the external table population.
B. Use the Oracle Data Pump export and import utility.
C. Use the conventional path data load of the SQL*Loader utility.
D. Use the INSERT INT..SELECT command to load the data

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