两个进程P、Q都需要三个资源1，2，3，系统中有资源1、2、3各一个，如果P请求资源的顺序是1、2、3，Q请求资源的顺序任意，共有3!=6种排列，其中共有()个排列可能导致死锁。
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The phrase "chipped away at" in the first paragraph probably means
A. appealed,
B. repealed.
C. aggravated.
D. consolidated.
What happened on Thursday？
A. Israel announced plans to build up to 750 new homes in a Jewish settlement.
B. A Palestinian gunman killed eight students at a Jewish seminary.
C. Israel stepped up security across the country.
D. Olmert promised to fight militants in the West Bank and Gaza.
What is the main point of the article？
A. This article explains why European retail is one of the few industries anywhere on the globe.
B. In Europe, government prevent the Wal-Martification.
C. The real megastore action is moving outside Western Europe.
D. Safeway has become a particularly hot commodity in part because many of its stores have the combination of size and location.
死锁的预防是通过破坏产生死锁的四个必要条件来实现的。下列方法中，破坏了“循环等待”条件的是()。
A. 资源按序分配策略
B. 银行家算法
C. 一次性分配资源策略
D. 资源分配图化简法
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