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什么是同步补偿机？主要用途是什么？

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分析价差的变化对跨期套利结果的影响。

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无烟煤就是指挥发分含量较高，难以点燃，燃烧特性差的煤种。

A. 正确
B. 错误

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下列何段消化管的粘膜下层中具有消化腺（）。

A. 结肠
B. 胃
C. 十二指肠
D. 回肠

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While Monitoring the space usage in your database that is in ARCHIVELOG mode you observed that the flash recovery area does not have enough free space to accommodate any more files and you do not have necessary permissions to add more space to it. Identify the two events that can occur in the event of a log switch? （）(Choose two.)

An entry is created in the alert log file and the database instance continues to function normally
B. The log switch hangs occur for transactions until free space is available in the flash recovery area
C. The Oracle database server deletes a file that is on the obsolete file list to make free space in the flash recovery area
D. The database instance status is implicitly changed to RESTRICTED mode and file creations to the flash recovery area are prevented

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