题目内容

在空压机站中设置冷却水装置的作用是什么?

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You executed this command to create a temporary table: SQL> CREATE GLOBAL TEMPORARY TABLE report_work_area (startdate DATE, enddateDATE, class CHAR(20)) ON COMMIT PRESERVE ROWS; Which statement is true about the rows inserted into the REPORT_WORK_AREA table during a transaction()

A. The rows stay in the table only until session termination.
B. The rows stay in the table only until the next transaction starts on the table.
C. The rows are visible to all current sessions after the transaction is committed.
D. The rows stay available for subsequent sessions after the transaction is committed

随着收入的提高,哪个的需求量可能会下降?()

A. 图书
B. 米饭
C. 水果
D. 旅游

TDCS系统应保证24小时运行,不得擅自关闭()。

A. 电源
B. 主机
C. 系统
D. UPS

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