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【单选题】
The word science is heard so often in modern times that almost everybody has some notion of its meaning. On the other hand, its definition is difficult for many people. The meaning of the term is confused, but everyone should understand its meaning and objectives. Just to make the explanation as simple as possible, suppose science is defined as classified knowledge (facts). Even in the true sciences distinguishing fact from fiction is not always easy. For this reason great care should be taken to distinguish between beliefs and truths. There is no danger as long as a clear difference is made between temporary and proved explanations. For example, hypotheses and theories are attempts to explain natural phenomena. From these positions the scientist continues to experiment and observe until they are proved or discredited. The exact statue of any explanation should be clearly labeled to avoid confusion. The objectives of science are primarily the discovery and the subsequent understanding of the unknown. Man cannot be satisfied with recognizing that secrets exist in nature or that questions are unanswerable he must solve them. Toward that end specialists in the field of biology and related fields of interest are directing much of their time and energy. Actually, two basic approaches lead to the discovery of new information. One, aimed at satisfying curiosity, is referred to as pure science. The other is aimed at using knowledge for specific purposes—for instance, improving health, raising standards of living, or creating new consumer products. In this case knowledge is put to economic use. Such an approach is referred to as applied science. Sometimes practical-minded people miss the point of pure science in thinking only of its immediate application for economic rewards. Chemists responsible for many of the discoveries could hardly have anticipated that their findings would one day result in application of such a practical nature as those directly related to life and death. The discoveries of one bit of information opens the door to the discovery of another. Some discoveries seem so simple that one is amazed they were not made years ago however, one should remember that the 'construction of the microscope had to precede the discovery of the cell. The host of scientists dedicating their lives to pure science are not apologetic about ignoring the practical side of their discoveries they know from experience that most knowledge is eventually applied. To define science we may simply call it ______.
A.
the study of unrelated subjects
B.
an attempt to explain natural phenomena
C.
the study of unrelated fields
D.
classified knowledge
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【判断题】IPv6采用128位地址长度,几乎可以不受限制地提供地址
A.
正确
B.
错误
【单选题】直流继电器都是( )继电器
A.
感应继电器
B.
交流继电器
C.
电磁继电器
D.
直流继电器
【单选题】全国道德模范全二平是巴彦卓尔市乌拉特前旗邮政局小余太珍邮政所所长兼乡邮员。 2007年11月11日,当选为唯一一个代表13亿中国人赴希腊雅典奥林匹克城传递奥运圣火的国际火炬手。并作为全国道德模范代表在2008年春节联欢晚会上向全国人民拜年。以下说法正确的是( )
A.
道德模范是我们民族宝贵的精神财富
B.
让中华美德走出过门,走向世界
C.
学习道德模范是世界人民的义不容辞的责任
D.
道德可以替代法律
【判断题】直流继电器是由直流电供电的,直流继电器都是电磁继电器。
A.
正确
B.
错误
【简答题】遮光目的有两个:一是 ;二是 。遮光的方法主要有 、 、 。
【判断题】交流继电器是由直流电源供电的继电器。大部分信号继电器都是直流继电器。
A.
正确
B.
错误
【判断题】IPv6采用128位地址长度,几乎可以不受限制的提供地址。
A.
正确
B.
错误
【单选题】设f(x)=sinx,则不定积分 =_____________
A.
sinx+C
B.
cosx+C
C.
-sinx+C
D.
-cosx+C
【单选题】设函数f(x)=sinx,则不定积分∫f'(x)dx=
A.
sinx+C
B.
cosx+C
C.
-sinx+C
D.
-cosx+C
【单选题】IPV6采用( )位地址长度,几乎可以不受限制地提供地址。
A.
32
B.
64
C.
128
D.
256
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