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问题 单项选择题

从2005-2010年，某市商品房销售量分别为50万m2、100万m2、180万m2、200万m2、320万m2、400万m2，若以2006年为基期，则2010年该市商品房销售量的定基增长速度为( )%。

A．100
B．200
C．300
D．400

答案

参考答案：C

解析：定基发展速度是报告期水平与某一固定时期水平之比，用于反映现象在整个时期内总的发展变化程度。定基发展速度=报告期发展水平/固定基期发展水平×100%=400÷100×100%=400%。而定基增长速度=定基发展速度-100%=400%-100%=300%。

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）处填（）。

A．uncertainty

B．unreliability

C．randomness

D．inconsistency
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单项选择题

500欧元采用了（）触摸标记。

A.胶印

B.凸印

C.凹印

D.复印
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