Which four are true regarding the Workspace Manager in Oracle9i？ （） ["Automatically versions all tables.","Automatically installed with Oracle9i.","Merges changes with parent rows or discard changes.","Provides mechanism to identify and resolve conflicts.","Allows for version enabling tables by use of a packages procedure."]
在皮亚杰的认知发展理认中，守恒性和可逆性出现在（）阶段。 ["感知运动阶段","前运算阶段","具体运算阶段","形式运算阶段"]
数据仓库系统主要有（）和（）两个部分。
当某个气缸不工作时，下列说法哪个是错误的（）。 ["个别气缸火花塞不跳火","个别气缸高压线漏电","点火正时不准","分电器旁电极漏电"]
以下不属于值类型的是（）。 ["结构","对象","内置值类型","枚举"]
简述影响压力应对的主观因素。
