单项选择题
A. They consist of one or more Scheduler programs.
B. They are used to implement dependency scheduling.
C. They are used to implement time-based scheduling.
D.They are used to implement event-based scheduling.
E.None of the above.
多项选择题 When a job exceeds the date specified in its END_DATE attribute, which of the following will happen?（）
单项选择题 If a job references a schedule that has been disabled, what will be the result?（）
单项选择题 What is the danger associated with stopping a running job by using the STOP_JOB procedure?（）