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问题 单项选择题

进程的3个基本状态为执行状态、就绪状态和阻塞状态，从执行状态到阻塞状态是由（）引起的。

A.进程请求I/O操作

B.进程调度

C.V操作

D.就绪队列中出现更高优先级的进程

答案

参考答案：A

解答题

圆的半径、直径、面积分别用r、d、s表示，则2r2＜S＜d2．______．
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单项选择题

There are several steps that can be taken, of which the chief one is to demand of all the organizations that exist with the declared objectives of safeguarding the interests of animals that they （） clearly where they stand on violence towards people.

A. will declare

B. should declare

C. have declared

D. are declaring
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