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问题 单项选择题

介导Ⅱ型变态反应的是

A．细胞因子
B．抗原抗体复合物
C．T细胞
D．肥大细胞
E．抗原、抗体、补体

答案

参考答案：E

解析：Ⅱ型变态反应是抗体直接作用于相应细胞或组织上的抗原，在补体、巨噬细胞和NK细胞参与下造成损伤的反应。

单项选择题

With the widespread use of the personal computer, many authorities in the field of (56) have pointed out the need for computer literacy.

Unfortunately, there is no (57) agreement as to what the term "computer literacy" means. Some feel that computer literacy means knowing how to make the computer "compute"; that is knowing how to program computers in one or more programming languages.

Others feel that knowing how to program is merely a small segment of computer literacy. These people (58) the major emphasis in schools should be on teaching how to effectively use the many software packages that are available.

Still others suggest that computer literacy education is not required. They suggest that computers are being so rapidly integrated into our society that using a computer will be as (59) as using a telephone or a video tape recorder, and that special education will not be necessary. (60) of one’s definition of computer literacy, it is recognized by most that learning to use a computer is indeed an important skill in modern society.

56（）

A.culture 

B.science 

C.education 

D.industry
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单项选择题

有触点电器的触头处于工作状态时，有负载电流通过，要解决的核心问题是（）。

A、电弧的熄灭；

B、机械振动；

C、触头的发热；

D、触头的散热
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