单项选择题
Which of the following is true about job chains？（）
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.
单项选择题 Ifajobreferencesaschedulethathasbeendisabled，whatwillbetheresult？（）
单项选择题 WhatisthedangerassociatedwithstoppingarunningjobbyusingtheSTOP_JOBprocedure？（）
多项选择题 WhichofthefollowingSchedulerelementsencourageobjectreuse？（）
