You need to generate a list of all customer last names with their credit limits from the CUSTOMERS table. Those customers who do not have a credit limit should appear last in the list. Which two queries would achieve the required result?（） SELECT cust_last_name, cust_credit_limit FROM customers ORDER BY cust_credit_limit DESC。 SELECT cust_last_name, cust_credit_limit FROM customers ORDER BY cust_credit_limit。 SELECT cust_last_name, cust_credit_limit FROM customers ORDER BY cust_credit_limit NULLS LAST。 SELECT cust_last_name, cust_credit_limit FROM customers ORDER BY cust_last_name, cust_credit_limit NULLSLAST。
数字式控制仪表的核心是（） 调节器。 变送器。 微处理器。
While running long running queries， you receive the Snapshot too old error. Which advisor can help you to avoid the Snapshot too old error？（） Memory Advisor。 Segment Advisor。 Undo Advisor。 SQL Tuning Advisor。
机器或部件是由（）装配成的。 A、零件 。 B、部件 。 C、标准件 。 D、传动件。
You use the Memory Advisor to tune the memory structures of your database. What is the prerequisite to use the Memory Advisor？（） The database must be in the ARCHIVELOG mode.。 The automatic memory tuning must be enabled.。 The change tracking feature must be enabled.。 The automatic memory tuning must be disabled.。
企业价值评估中，在对各单项资产实施评估并且将评估值加和后，再运用收益法评估整个企业价值，这样做可以（）。
