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【单选题】
下面有关进程的描述,( )是正确的。A.
进程执行的相对速度不能由进程自己来控制
B.
进程利用信号量P、V操作可以交换大量的信息
C.
并发进程在访问共享资源时，不可能出现于时间有关的错误
D.
P、V操作不是原语操作
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【单选题】T hese programs are important to business success and will also contribute to the community at large.
A.
这些重要项目都是为了兴办企业的，这也会对社区有很大的促进。
B.
这些程序的成功与做生意一样重要，并且有益于扩大社区的规模。
C.
这些项目对商业的成功至关重要，还会在总体上对社区做出贡献。
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