Which two statements are true when row archival management is enabled?()
A. The ORA_ARCHIVE_STATE column visibility is controlled by the ROW ARCHIVAL VISIBILITY session parameter.
B. The ORA_ARCHIVE_STATE column is updated manually or by a program that could reference activity tracking columns, to indicate that a row is no longer considered active.
C. The ROW ARCHIVAL VISIBILITY session parameter defaults to active rows only.
D. The ORA_ARCHIVE_STATE column is visible if referenced in the select list of a query.
E. The ORA_ARCHIVE_STATE column is updated automatically by the Oracle Server based on activity tracking columns, to Indicate that a row is no longer considered active.
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用真空法脱气进行色谱分析时,需考察脱气装置的脱气效率。
A. 正确
B. 错误
计算增值税时,一般纳税人应纳税额的计算公式为()。
A. 应纳税额=当期销项税额+当期进项税额
B. 应纳税额=当期销项税额-当期进项税额
C. 应纳税额=销售额×税率
D. 应纳税额=买价×税率
ZXCTN9004的QOS调度机制,每个物理端口支持()个输出队列
A. 4
B. 6
C. 8
D. 10
Z12V190B型柴油机进气门头底平面与缸盖平面间距离为()。
A. 1.3-2.6mm
B. 1.5-2.8mm
C. 1.7-3mm
D. 1.9-3.2mm