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井下作业工程监督交接班制度的交接内容有哪些？

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宋玉在《对楚王问》里写到：“客有歌于郢中者，其始曰《下里巴人》，国中属而和者数千人；其为《阳阿薤露》，国中属而和者数百人；其为《阳春白雪》，国中属而和者不过数十人而已。”请结合这段话谈谈审美理解的意义和特征。

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晶体管触发电路中，产生触发脉冲的晶体管工作在开关状态。

A. 正确
B. 错误

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切应力互等定律

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Because of a logical corruption in your production database, you wanted to perform Tablespace Point in Time Recovery (TSPITR). But before you start the recovery, you queried the TS_PITR_OBJECTS_TO_BE_DROPPED view and realized that there are a large number of objects that would be dropped when you start the recovery by using this method.You want to preserve these objects. Which option must you use to perform TSPITR and preserve the object?（）

A. Perform Export before TSPITR and Import after TSPITR
B. Move objects to another schema that has the same tablespace assigned
C. Perform Incomplete Recovery before TSPITR with the Log Sequence Number (LSN)
D. Perform Incomplete Recovery before TSPITR with the System Change Number (SCN)

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