[多选] Which two statements are true regarding B-tree indexs（）

A . The leaf blocks in the index are doubly linked.
B . The leaf node stores a bitmap for each key value.
C . The rows with NULL value in key columns also have entries in the index.
D . The deletion of a row from the table causes a logical deletion in index leaf block and the space becomesavailable for the new leaf entry

用于大流量、岩基或覆盖层较薄的岩基河床，且无需架设浮桥或栈桥的抛投合龙方法是（）平堵法。混合堵法。立堵法。爆破法。从归因和情绪的角度，说明为什么遭受失败的运动员非常需要安慰。 You executed the following FLASHBACK TABLE command： FLASHBACK TABLE emp TO TIMESTAMP （’11：45’，’hh12：mi’）; Which two statements are correct？（） The FLASHBACK TABLE statement will not be written to the alert log file.。 The changes made to the EMP table since the specified time will be undone.。 The EMP table that was dropped by mistake from the database will be restored.。 The FLASHBACK TABLE statement will be executed within a single transaction.。 The FLASHBACK TABLE statement will not maintain the existing indexes on the EMP table. 。 The list of transactions that have modified the EMP table since the specified time will be displayed.。要减少企业的多元化和战略性地发展核心业务，则企业退出的方式为（）．修剪。范围收缩。规模收缩。市场缩。简述意外伤害保险的含义。 Which two statements are true regarding B-tree indexs（）

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[多选] Which two statements are true regarding B-tree indexs（）

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