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分析祥林嫂出逃、抗婚、再嫁的实质。

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什么是自由基反应？

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《特种设备安全监察条例》规定，检验检测机构接到定期检验要求后，应当按照安全技术规范的要求（）进行安全性能检验和能效测试。

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In your test database， you have created the ORDERS table as an index-organized table （IOT）. To facilitate faster querying， you have created a mapping table and a bitmap index on the ORDER_FILLED column. You observe that the query performance degrades when users perform a large volume of transactions. While investigating the reason， you find that the mapping table segment is fragmented， leading to poor performance. Which option would you use to defragment the mapping table without affecting the original table data？（）

A. export and import the mapping table
B. drop and re-create the mapping table
C. truncate the mapping table and reinsert the values
D. use the ALTER TABLE···REBUILD command to defragment the mapping table

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