题目内容

无绝缘自动闭塞区段,禁止机车全部停留在调谐区内,特殊情况确须停留时,作业程序为:在()短路铜线→汇报车站或调度报告停车位置→撤除短接铜线→报告车站或调度开车。

A. 前方调谐区外
B. 后方调谐区外
C. 调谐区内

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You issued the following command: ALTER TABLE SCOTT.EMP SHRINK SPACE; The SCOTT.EMP table is stored in the DATA1 tablespace that has the following properties: DATA1 is a read/write tablespace. DATA1 is not autoextensible to an unlimited size. DATA1 is online. Segment space management for the DATA1 tablespace is manual. You issued the ALTER TABLE SCOTT.EMP SHRINK SPACE; command that generates the following error: ORA-10635: Invalid segment or tablespace type What could be the reason for the failure of the command?()

A. The tablespace, DATA1, is not read-only.
B. The tablespace, DATA1, is not autoextensible.
C. The tablespace, DATA1, is not offline.
D. The segment space management for the tablespace, DATA1, is manual.

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