训练目标为增强耐力时，一般采取的运动方法为（） 不断重复的被动运动方法。 所给负荷必须达到能使肌肉较快产生疲劳的水平，即负荷量应相当大。 动作重复次数比较少的运动。 重复次数较多而负荷量相对较小的练习方法。 尽量地加快动作进行速度的方法。
Your database instance is functional for the past one month. The Automatic Workload Repository（AWR） snapshot retention is set to 7 and the STATISTICS_LEVEL initialization parameter is set to TYPICAL. You receive a complaint about the poor performance of the database between 7 PM and 9 PM of theprevious day. Choose two actions any of which can be referred to first to diagnose the problem. （） Use the Active Session History report.。 Use the AWR Compare Periods report.。 Use an ADDM analysis between 7 PM and 9 PM of the previous day.。 Use the AWR Compare Period report between 7 PM and 9 PM of the previous day.。
铰削联轴器锥孔的铰刀，锥度为1：10。
春秋时期我国农业技术史上农用动力的一次革命是（）。 牛耕的运用。 都江堰等水利工程兴修。 耧车的发明。 在干旱地区使用代田法。
Given that the current directory is empty， and that the user has read and write privileges to the currentdirectory， and the following： Which statement is true？（） Compilation fails.。 Nothing is added to the file system.。 Only a new file is created on the file system.。 Only a new directory is created on the file system.。 Both a new file and a new directory are created on the file system.。
科学合理的（）是工期目标按期实现的前提条件
