单选

●产生死锁的4个必要条件是互斥、 (46) 、循环等待和不剥夺；一旦系统中出现了死锁，操作系统就应将陷入死锁的进程从死锁状态中解脱出来，使系统恢复正常运行。解除死锁的常用方法有两种 (47) 和 (48) 。
(46)

A．请求与拒绝 &n
bsp; B．请求与保护
C．请求与保持
D．保护与阻塞 (47) A．分步分配法
B．内存剥夺法
C．断点保存法
D．资源剥夺法 (48) A．部分分配法
B．优先级分配法
C．撤销进程法
D．内存剥夺法

试题出自试卷《2011年程序员考试考前密卷（六）-上午试题》

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●产生死锁的4个必要条件是互斥、 (46) 、循环等待和不剥夺；一旦系统中出现了死锁，操作系统就应将陷入死锁的进程从死锁状态中解脱出来，使系统恢复正常运行。解除死锁的常用方法有两种 (47) 和 (48) 。(46)

●产生死锁的4个必要条件是互斥、 (46) 、循环等待和不剥夺；一旦系统中出现了死锁，操作系统就应将陷入死锁的进程从死锁状态中解脱出来，使系统恢复正常运行。解除死锁的常用方法有两种 (47) 和 (48) 。
(46)