信任是人格发展中（）的普遍现象。
Why would you use the following FLASHBACK TABLE command？（） FLASHBACK TABLE emp TO TIMESTAMP （’11：45’，’hh12：mi’）; to undo the changes made to the EMP table since the specified time。 to restore the EMP table that was wrongly dropped from the database。 to view the transactions that have modified the EMP table since the specified time。 to view the changes made to the EMP table for one or more rows since the specified time。 to recover the EMP table to a point in time in the past by restoring the most recent backu。
Which two statements about subqueries are true? （） A single row subquery can retrieve data from only one table.。 A SQL query statement cannot display data from table B that is referred to in its subquery, unless table B is included in the main query's FROM clause.。 A SQL query statement can display data from table B that is referred to in its subquery, without including B in its own FROM clause.。 A single row subquery can retrieve data from more than one table.。 A single row subquery cannot be used in a condition where the LIKE operator is used for comparison.。 A multiple-row subquery cannot be used in an INSERT statement to insert multiple rows at a time.。
Which of the following is the lowest cost enterprise class IBM Storage System that can support anExchange 2010 solution?（） DS5100 。 Storwize V7000 。 DS8700 。 XIV system。
所用骨料的不同，划分的混凝土类别不包括（） 水泥混凝土。 矿渣混凝土。 碎石混凝土。 卵石混凝土。
下列各选项中，（）最有利于节税．
