广州公共汽车561路“柯子岭――车陂”，始末站为“柯子岭”和“车陂”，安排两个站长（基层调度员）分别负责这两个始末站的调度组织工作。设该线路17：00~18：00为高峰期，行车作业方案为高峰期单程运行时间40min，平峰期为35min。某天编号为001的车辆在线运行片段如下：第2车次在18：00从“车陂”开出，发车间距5分钟，车辆在18：35到达终点站“学校”站，运行是否正点？
You have specified the warning and critical threshold values of an application tablespace to be 60% and 70% respectively. From the tablespace space usage metrics， you find that the actual space usage has reached the specified warning threshold value， but no alerts have been generated. What could be the reason for this？（） [" The EVENT parameter was not set"," The SQL_TRACE parameter is set to FALSE"," The Enterprise Manager Grid Control is not used"," The STATISTICS_LEVEL parameter is set to BASIC"," The TIMED_STATISTICS parameter is set to FALSE"]
秦始皇统一中国后采取“废分封，立郡县”的决策，其主要目的在于（）。 ["维护皇权的至高无上","建立专制主义中央集权制度","巩固统一的封建国家","维护新兴地主阶级利益"]
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."]
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