调度集中由CTC中心系统、车站系统、网络通信系统三部分组成。
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有效管理小规模投资组合的方法不一定适用于在规模投资组合。
A. 正确
B. 错误
原油含胶状物质越高，在裂化过程中，就越易生成焦炭，使设备结焦。
A. 正确
B. 错误
Which statement is true when you run the SQL Tuning Advisor with limited scope？（）
Access path analysis is not performed for the SQL statements.
B. SQL structure analysis is not performed for the SQL statements.
C. SQL Profile recommendations are not generated for the SQL statements.
D. The staleness and absence of the statistics are not checked for the objects in the query supplied to the SQL Tuning Advisor.
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