【简答题】起重机起重一重物,该重物的重力 G=1000N,已知 =30 ,梁 AB的长度为L ,其自重不计,试求钢索 BC所受的拉力和铰链A的约束反力。
【多选题】What happens when you run the SQL Tuning Advisor with limited scope?()
A.
Access path ysis is not performed for SQL statements.
B.
SQL structure ysis is not performed for SQL statements.
C.
SQL Profile recommendations are not generated for SQL statements.
D.
Staleness and absence of statistics are not checked for the objects in the SQL Tuning Advisor. In this case, SQL Tuning Advisor produces recommendations based on statistical checks, access path ysis, and SQL structure ysis. SQL profile recommendations are not generated.
【简答题】在皮亚杰关于儿童思维发展的阶段理论中,2~7岁儿童的思维处于( )A. 前运算阶段 B. 感知运动阶段 C. 具体运算阶段 D. 形式运算阶段
【判断题】任何一个可逆的化学反应,当达到平衡时各反应物和生成物的浓度等于常数。
【判断题】任何一个可逆的化学反应 , 当达到平衡时各反应物和生成物 的浓度等于常数
【简答题】陈老师要求学生分组汇报自主学习的文献综述,按汇报质量给小组评分,作为平时成绩。自主学习汇报6次,每周一次,全班学生分成6个小组来汇报,为了避免汇报顺序对汇报的影响(按之前的经验,排序在前的汇报组会占用更多的时间,中间的汇报组得到师生的关注和反馈比较省,排序在后的汇报组发现和前组有相同或相似主题时重复还是省略是一个两难选择),请为汇报设计一个拉丁方汇报顺序。
【单选题】By tuning this knob to the right you can______ the sound from this radio.
【单选题】You are creating a SQL Tuning Set to allow a group of SQL statements to be passed into the SQL Tuning Advisor. Which packages will you use to create the SQL Tuning Set?()
A.
DBMS_WORKLOAD_REPOSITORY