[单选题]关于变压与弱磁配合控制的直流调速系统中,下面说法正确的是( ).A 当电动机转速低于额定转速时,变压调速,属于恒转矩性质调速.B 当电动机转速高于额定转速时,变压调速,属于恒功率性质调速.C 当电动机转速高于额定转速时,弱磁调速,属于恒转矩性质调速.D 当电动机转速低于额定转速时,弱磁调速,属于恒功率性质调速.
[填空题]戴维宁定理中,将除去负载电阻外,可将其余部分看作一个有源二端网络,即可以等效为一个 串联一个 的形式.
[填空题]选出一两篇优秀作文进行深入分析,用典型指导一般的作文讲评方式是
[单选题]毛石矩形截面基础上部宽一般比墙厚大A.100mmB.150mmC.200mmD.300mm
[判断题]某单位会计电算化的实施与该单位的性质、行业、规模等因素有关,其最终目的是要建立一个适应本单位会计管理工作所需要的电算化会计信息系统.
[填空题]巴甫洛夫主张,( )是人特有的心理现象.
[单选题]SCI与其他文献检索刊物不同之处在于( ). A、 它具有团体索引 B、 它具有引文索引 C、 它可以了解某著者发表论文情况 D、 它可以了解科研的最新动态
[问答题]Psychologists have discovered that even the most independent-minded of us will conform to social pressure when we are with a group of people. In one classie experiment, people were shown a vertical line and asked to find a line of identical length from a selection of three. You might think that this is an absurdly easy task, and when people perform it by themselvesthey do it very well. However, psychologists have discovered that we are very easily swayed by the opinions of other people when we do this task in a group. In one study, a group of three people was set up,where two of the people were confederates(同伙)of the experimenter.When the confederates deliberately gave wrong answers,people were often swayed to give the wrong answer also. In fact, 75% of people gave at least one wrong answer, with some people conforming to peer pressure on every occasion. was set up,where two of the people were confederates(同伙)of the experimenter.When the confederates deliberately gave wrong answers,people were often swayed to give the wrong answer also. In fact, 75% of people gave at least one wrong answer, with some people conforming to peer pressure on every occasion. But why do people conform in this way In an easy task like this, it seems that people do not want to step out of line with the prevailing opinion of the group. On more difficult tasks, people also conform because they lose〔onfidence in their own ability to make decisions and prefer to trust the majority opinion instead. A typical example of this kind of conformity arises when we come across people in distress. Would you help a woman who has been attacked in the street It turns out that you are much more likely to go to her assistance if you are alone.When other people are also around,a diffusion of responsibility occurs. People are paralysed into inaction, because everyone assumes that someone else will go to the woman. s assistance. 8.In Paragraph 1, the underlined word conform probably means“ 9.What is the purpose of the experiment described in Paragraph 2 To 10. In the last paragraph, according to the author,why wouldn’t one help the woman .1l.What method does the author mainly use to develop the text
[单选题]尘粒的自由沉降速度与( )的平方成正比.A. 尘粒的密度. B. 气体的密度.C. 尘粒的粒径. D. 气体的粘度.
[单选题]国有经济的主导作用,主要体现为( ) A、 控制力 B、 影响力 C、 协调力 D、 竞争力
[单选题]经济特区的“特”的含义是实行特殊的( ) A、 经济政策和管理体制 B、 政治制度 C、 法律法规 D、 生活方式
[单选题]在教育调查研究中,最基本的调查手段是( )A.问卷调查B.访谈调查C.测量调查D.调查表法
[单选题]公路自然区划中二级区划是以潮湿系数K为主要指标,K是表示 A.平均相对含水量B.年蒸发量/年降雨量C.年降雨量 - 年蒸发量D.年降雨量 - 年蒸发量
[单选题]电力系统的综合供电负荷加上厂用电之和,称为( )A.发电负荷B.供电负荷C.用电负荷D.工业负荷
[多选题]催化剂的一般组成包括( )A.主催化剂B.助催化剂C.共催化剂D.载体
[名词解释]下列说法正确的是D
[单选题]在调速系统中,电压微分负反馈及电流微分负反馈是属于( )环节.A 反馈环节 B 稳定环节 C 放大环节 D 保护环节
[问答题]简述教育研究中定性分析的特点
[问答题]在工程选址时,应避开的地段是哪些
[问答题]在逻辑中的“1”和“0”用来表示
[判断题]几个机关或部门的联合发文,一般应由主办该公文的单位负责,送请有关联署机关或部门的承办人会签.