问题
填空题
为了便于系统控制和描述进程的活动过程，在操作系统核心中为进程定义了一个专门的数据结构，称为______。
答案
参考答案：进程控制块或PCB
解析： 创建一个进程的主要任务是建立进程控制块PCB。具体操作过程是：先申请一空闲PCB区域，将有关信息填入PCB，置该进程为就绪状态，最后把它插入到就绪队列中。
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为了便于系统控制和描述进程的活动过程，在操作系统核心中为进程定义了一个专门的数据结构，称为______。
参考答案：进程控制块或PCB
解析： 创建一个进程的主要任务是建立进程控制块PCB。具体操作过程是：先申请一空闲PCB区域，将有关信息填入PCB，置该进程为就绪状态，最后把它插入到就绪队列中。
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| Today the problem of environment has become more and more serious. Every day, every hour, the air, forests, soil, oceans and fresh 1 are becoming dirtier and dirtier. There are two 2 for the problem: the excessive (过度) use of natural resources and pouring a lot of 3 waste in the course of production. Yet, man 4 great progress in environmental protection. Scientists and inventors are trying to develop 5 engines for automobiles. Governments of many countries have made 6 to protect the natural resources. More and more people have realized the importance of environmental protection and are doing what they can to protect our surroundings. Still more ways 7 to solve the problem. People should be educated in 8 modern methods to protect the environment and learn to make clever use of recycling our natural resources. The government of all 9 should take ways to fight against pollution _ 10 _ protecting the environment is not only protecting our home but also the civilization (文明) of the humankind. | |||
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