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问题 单项选择题

根据《邮政法》，因国家安全或者追查刑事犯罪的需要，邮政企业、快递企业有义务配合公安机关、国家安全机关或者检查机关，对有关邮件、快件依法（ ）。

A．销毁

B．退回

C．公开

D．检查、扣留

答案

参考答案：D

单项选择题

In information theory, "information" is regarded as knowledge which reduces or removes (71) about the occurrence of a specific event from a given set of possible events. The concept "event" is to be understood as used in the theory of probability. For instance, an event may be the occurrence of a (72) character or word in a given message or in a given position of a message.

In communication theory, channel is defined as that part of a communication system that connects the message source with the message sink. An encoder may be inserted between the message source and the input to the channel, and a (73) between the output of the channel and the message sink. Generally, these two units are not considered as being parts of the channel. In certain cases, however, they may be considered as pans of the message source and message sink, (74) . In information theory (75) to Shannon, the channel can be characterized by the set of conditional probabilities of occurrence of all the messages received at the message sink when a given message emanates from the message source.

（71）是（）

A.uncertainty

B.unreliability

C.randomness

D.inconsistency
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问答题

在公共汽车上，司机负责开车、停车和驾驶，售票员负责门的开门、关门和售票。基本操作规则是只有停车后，售票员才能开门，只有售票员关门后，司机才能开车。汽车初始状态处于行驶之中。当只有1个司机、2个售票员、2个门、每个售票员负责一个门时的协调操作。请使用P、V原语实现售票员与司机之间的协调操作，说明每个信号量的含义、初值和值的范围。
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