在（）条件下天然气中某些气体组分能和液态水形成水化物 一定压力。 一定温度。 一定的压力和温度。
You work as a database administrator for Certkiller .com. In your transaction application， you have scheduled a job to update the optimizer statistics at05：00 pm every Friday. The job has successfully completed. Which three pieces of information would you check to confirm that the statistics have been collected？（） Average row size。 Last analyzed date。 Size of table in bytes。 Size of table in database blocks。 Number of free blocks in the free list。 Number of extents present in the table.。
90年代小说创作存在的主要问题是什么？
静摩擦
You work as a database administrator for Certkiller .com. You want to be notified when the number of disk I/O increases by 10% of what it was yesterday. You create a baseline metric for yesterday’s disk I/O performance. How do you use the baseline metrics to achieve your objective？（） Save the baseline in the database。 Save the baseline in the Database Control Home Page。 Create a procedure to read and apply the baseline to disk I/O metrics。 Apply the baseline to the disk I/O metrics in the Mange Metrics page。 Alter the disk I/O metrics to include baseline by using the ALTER METRICScommnd。
一个国家的经济发展包括以下几方面的变化（）
