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问题 单项选择题 A1/A2型题

CAP最常见的病原体不包括（）

A.支原体

B.肺炎克雷伯杆菌

C.流感嗜血杆菌

D.肺炎链球菌

E.卡他莫拉菌

答案

参考答案：B

解析：CAP常见病原体包括：肺炎链球菌，流感嗜血杆菌，卡他莫拉菌，非典型致病菌。

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.

（74）是（）

A.debugger

B.decoder

C.decompiler

D.demodulator
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单项选择题 A1/A2型题

比较RIA和IRMA的说法错误的是（）。

A.RIA所用抗体为多克隆性，对抗体亲和力的要求高，用量少

B.IRMA对抗体亲和力的要求不及RIA，但用量大

C.RIA可以测定大小分子抗原

D.IRMA反应易受交叉反应物的干扰，测定特异性不及RIA

E.IRMA只能测定至少有两个抗原决定簇的抗原
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