题目内容

电厂减少散热损失主要是减少设备外表面与空气间的换热系数，通常利用增加（）厚度的方法来增大热阻。

A. 保温层；
B. 绝缘层；
C. 钢管壁；
D. 厂房墙壁。

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You execute the following command to audit the database activities： SQL> AUDIT DROP ANY TABLE BY scott BY SESSION WHENEVER SUCCESSFUL; What is the effect of this command？（）

A. One audit record is created for the whole session if user SCOTT successfully drops one or more tables in his session.
B. One audit record is created for every session when any user successfully drops a table owned by SCOT
C. One audit record is created for each successful DROP TABLE command executed by any user to drop tables owned by SCOT
D. One audit record is generated for the session when SCOTT grants the DROP ANY TABLE privilege to other users in his session.
E. One audit record is created for each successful DROP TABLE command executed in the session of SCOT

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