YouworkasadatabaseadministratorforCertkiller.com.Inyourdevelopmentenvironmentenvironment,thedevelopersareresponsibleformodifyingthetablestructureaccordingtotheapplicationrequirements.However,youwanttokeeptrackoftheALTERTABLEcommandsbeingexecutedbydevelopers,soyouenableauditingtoachievethisobjective.Whichtwoviewswouldyourefertofindouttheauditinformation?()
A.DBA_AUDIT_TRAIL
B.DBA_AUDIT_SESSION
C.DBA_FGA_AUDIT_TRAIL
D.DBA_COMMON_AUDIT_TRAIL
第1题:
状态转移矩阵Φ(t-t0)等于
A.Φ(t-t1) Φ(t1-t0)
B.Φ(t-t2)Φ(t2-t1) Φ(t1-t0)
C.Φ(t-t3) Φ(t3-t2)Φ(t2-t1) Φ(t1-t0)
D.Φ(t) Φ(-t0)
第2题:
以下元组演算公式与关系代数R È S、R - S、 R Ç S的等价性相对应的一组是_________。
A.{ t | tÎR Ú tÎS } 、{ t | tÎR Ù tÏS } 、{ t | tÎR Ù tÎS }
B.{ t | tÎRÙ tÎS } 、{ t | tÎR Ù tÏS } 、{ t | tÎR ÚtÎS }
C.{ t | tÎR Ú tÏS } 、{ t | tÎR Ù tÎS } 、{ t | tÎR Ù tÏS }
D.{ t | tÎR Ù tÎS } 、{ t | tÎR Ú tÎS }
第3题:
x(t-t1)*δ(t-t2)=()
A.x(t-t1- t2)
B.δ(t-t1- t2)
C.x(t-t2)
D.δ(t-t1)
第4题:
对于6关节串联型机器人来说,如果求出了任一个相邻两级之间的坐标变换矩阵Ti,那么从手坐标到基坐标的坐标变换矩阵为()
A.T=T1T2T3T4T5T6
B.T=T6T5T4T3T2T1
C.T=T6T5T4T3T1T2
D.T1T2T3T4T6T5
第5题:
15、以下元组演算公式与关系代数R È S、R - S、 R Ç S的等价性相对应的一组是_________。
A.{ t | tÎR Ú tÎS } 、{ t | tÎR Ù tÏS } 、{ t | tÎR Ù tÎS }
B.{ t | tÎRÙ tÎS } 、{ t | tÎR Ù tÏS } 、{ t | tÎR ÚtÎS }
C.{ t | tÎR Ú tÏS } 、{ t | tÎR Ù tÎS } 、{ t | tÎR Ù tÏS }
D.{ t | tÎR ÚtÏS } 、{ t | tÎR Ù tÎS } 、{ t | t&Ici