多道程序设计的引入给存储管理提出了新课题,应必须考虑的三个方面问题是什么?
参考答案:
应必须考虑的三个方面的问题是:存储保护,存储分配,存储扩充.
You _____ be hungry already - you had lunch only two hours ago! [ ]
A. wouldn't
B. can't
C. mustn't
D. needn't
试述价值工程的活动程序。