无形资产的财务成本特征表现在（）。 弱对应性。 共益性。 积累性。 虚拟性。
Consider the following: Which statement best describes the meaning of the value for the key_len column?（） It shows the total size of the index row。 It shows how many columns in the index are examined。 It shows the number of characters indexed in the key。 It shows how many bytes will be used from each index row。
利润
In your Supportcenter.cn database server the parameter PLSQL_CODE_TYPE has been set to NATIVE. Which object would be achieved by the setting？（） The source PL/SQL code will be stored in native machine code.。 The source PL/SQL code will be stored in interpreted byte code.。 The compiled PL/SQL code will be stored in native machine code.。 The compiled PL/SQL code will be stored in interpreted byte code.。
用户供电压三相不对称不得超过（）。 1％。 5％。 10％。 15％。
Which command should an administrator use to put a system in maintenance mode without rebooting？（）
