You have been recently hired as a database administrator. Your senior manager asks you to study the production database server and submit a report on the settings done by the previous DBA. While observing the server settings， you find that the following parameter has been set in the parameter file of the database： REMOTE_OS_AUTHENT = TRUE What could have been the reason to set this parameter as TRUE？（）
A. to enable operating system authentication for a remote client
B. to restrict the scope of administration to identical operating systems
C. to allow the start up and shut down of the database from a remote client
D. to enable the administration of the operating system from a remote client
E. to disable the administration of the operating system from a remote client
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Which two statements about subqueries are true? （）
A subquery should retrieve only one row.
B. A subquery can retrieve zero or more rows.
C. A subquery can be used only in SQL query statements.
D. Subqueries CANNOT be nested by more than two levels.
E. A subquery CANNOT be used in an SQL query statement that uses group functions.
F. When a subquery is used with an inequality comparison operator in the outer SQL statement, the column list in the SELECT clause of the subquery should contain only one column.
DF4B型内燃机车冷却器共有（）冷却单节。
A. 58个
B. 60个
C. 56个
D. 52个
小儿拇指屈伸腱鞘炎的临床表现为（）。
A. 与成人相同
B. 拇指掌指关节屈曲，运动困难
C. 用力屈伸时不会出现弹响声
D. 拇指间关节扳动后方能被动伸直，并出现弹响声
E. 以上均不正确
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