若有一个仓库,可以存放P1、P2 两种产品,但是每次只能存放一种产品。要求: ① w= P1 的数量 – P2 的数量 ② – i < w < k (i、k 为正整数) 若用 PV 操作实现P1 和P2 产品的入库过程,至少需要 (23) 个同步信号量及 (24) 个互斥信号量,其中,同步信号量的初值分别为 (25) ,互斥信号量的初值分别为 (26) 。 (23)处填()。
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(66) data effectively is crucial for success in today’s competitive environment.Managers must know how to use a variety of tools. Integrated data takes information from different sources and puts it together in a meaningful and useful way. One of the difficulties of this is the (67) in hardware and software. (68) integration uses a base document that contains copies of other objects. (69) integration uses a base document that contains the current or most recent version of the source document it contains.(70) provides an overview of the program written in “plain” English,without the computer syntax. (70)处填()。
A. High-level language
B. Decision tree
C. Pseudocode
D. Flowchart
在面向对象技术中,类属是一种 (1) 机制。一个类属类是关于一组类的一个特性抽象,它强调的是这些类的成员特征中与 (2) 的那些部分,而用变元来表示与 (3) 的那些部分。 (2)处填()。
A. 具体对象无关
B. 具体类型无关
C. 具体对象相关
D. 具体类型相关