[单选题]乙类功率放大电路中,功放的能量转换效率在理想情况下,可达到.A.0.5B.75%C.0.785D.以上都不是
[填空题]TTL与非门多余的输入端应接( )
[单选题]战略实施离不开信息系统的支持.在战略实施过程中,信息系统的重要作用体现在战略分解与沟通、战略表达以及( ) .A.战略反馈B.战略假设C.战略互动D.战略循环
[单选题]毛泽东指出,要用民主的方法解决人民内部矛盾.正确处理政治思想领域的人民内部矛盾应采取的方针是( )A. 团结-批评-团结B.百花齐放、百家争鸣C.长期共存、互相监督D.统筹兼顾、适当安排
[单选题]商品是( )的矛盾统一体. A. 不变资本和可变资本 B. 私人劳动和社会劳动 C. 使用价值和价值 D. 社会必要劳动时间和个别劳动时间
[名词解释]什么是指令
[填空题]_____________的对象是一系列与经济的总体运行相关的变量.
[阅读理解]Sequoyah was a young Cherokee Indian,son of a white trader and an Indian Squaw(北美印第安.女人).At an early age,he became fascinated by tile talking leaf,an expression that he used todescribe the white man.s written recorde.Although many believe thistalking leafto be a gift from tileGreat Spirit,Sequoyah refused to accept that theory.Like other Indians of tile period,he wes illiterate,but his determination to remedy tile situation led to the invention of a unique 86 character al phabet based on the sound patterns that he heard.His family and friends thought him mad,but while recuperating(恢复)from a hunting aociden,he diligently and independentdly set out to creute a form of communication for his own people a wellasfor other Indians.In 1821,after twelve years of work,he had successfully developed a writen langouagethat would enable thousands of Indians to read and write.Sequoyah.s desire to preserve words and events for later generation has caused him to beremembered among the important inventors.The giant redwood trees of California,calledsequoias(红杉)"in his honor,will further imprint his name in history.46.What is the most important reason that Sequoyah will be remembered A.California redwoods were named in his honor.B. He was illiterate.C.He created a unique alphabet.D.He recovered from his madness and helped mankind.47.How did Sequoyah.s family react to his idea of developing his owntalking leaf A.They arranged for his hunting accident.B.They thought he was crazy.C.They decided to help him.D.They asked him to teach them to read and write.48.What prompted Sequoyah to develop his alphabet A.People were writing things about him that he couldn.t read.B.He wanted to become famous.C.After his hunting accident,he needed something to keep him busy.D.Future generations.49.How would you describe Sequoyah A.Determined.B.Mad.C.Backward.D.Meek(温顺的).50.Which of the following is NOT true A.Sequoyah developed a form of writing with the help of the Cherokee tribe.B.Sequoyah was a very observant young man.C.Sequoyah spent twelve years developing his alphabet.D.Sequoyah was honored by having some trees named after him.
[单选题]在三相笼式电动机的正反转控制电路中,为了避免主电路的电源两相短路采取的措施是( ).A.自锁B.接触器C.互锁D.热继电器
[单选题]商品是( )的矛盾统一体. A. 不变资本和可变资本 B. 私人劳动和社会劳动 C. 使用价值和价值 D. 社会必要劳动时间和个别劳动时间
[填空题]扩展外围芯片时,片选信号的3种产生方法是:( )、( )和( ).
[填空题]触头的接触形式有: 、线接触、面接触.
[单选题]净出口是指:A.出口减去进口B.进口减去出口C.出口加进口D.输往其他国家用于消费和投资的物品
[多选题]公开市场业务通常具有( )作用.A.防止金融恐慌B.调控存款货币银行准备金和货币供给量C.影响利率水平和利率结构D.与再贴现政策配合使用,可以提高货币政策效果
[单选题]工件在某台机床(或某个工作地点)上,连续进行的那一部分工艺过程称为A.工序B.工步C.工位D.安装
[单选题]交流35kV母线电压是指_______.A.相电压等级B.线电压等级C.母线实际线电压D.以上都不对
[单选题]5行政作风是行政道德的构成要素和行政道德的( ).A.主观努力B.客观基础C.内在体现D.外在显现
[填空题]不受外界电磁干扰的信道是 通道.
[问答题]简述数据链路层、网络层和传输层的寻址.
[名词解释]瓦斯保护
[单选题]气体瓦斯保护是变压器的A.主后备保护B.内部故障的主保护C.外部故障的主保护D.外部故障的后备保护