机电传动系统稳定工作时，如果TM=TL，电动机旋转方向与TM相同，转速将产生的变化是（）。 减速。 加速。 匀速。 停止。
You work as a database administrator for Certkiller .com. Users complain that their query is taking a long time to complete. You suspect the database buffer cache size to be the reason， and you define an alert to be generated when the buffer cache hit metric goes below 85%. When you observe the dynamic performance views， you find that the buffer cache hit ratio is 81% but no alerts are being generated. What could be the reason for this problem？（） The advisory memory has been turned off.。 The DB_CACHE_ADVICE parameter has been set to OFF in the parameter file.。 The STATISTICS_LEVEL parameter has been set to BASIC in the parameter file.。 The TIMED_STATISTICS parameter has been set to FALSE in the parameter file.。 The STATISTICS_LEVEL parameter has been set to TYPICAL in the parameter file.。
角色扮演
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。
试鉴别下列各项哪些是改善设备电埸分布的措施（）。
