[单选题]三极管放大器中,当输入电流一定时,静态工作点设置太高,将产生( )失真.A.顶部失真B.底部失真C.全失真D.以上都不是
[单选题]我国循环式远动规约中规定的循环码是( )A.(7,4)循环码B.方阵码C.(7,3)循环码D.(48,40)循环码
[单选题]下列电气装置属于工作接地的是_______.A.变压器星形接线绕组的中性点接地B.电动机外壳接地C.避雷针接地D.开关柜框架接地
[单选题]以下符合绝对误差定义的是A.真值=近似值+绝对误差B.绝对误差=相对误差/真值C.近似值=真值+绝对误差D.相对误差=真值*绝对误差
[单选题]拉削时,在一次生程中就能切除全部加工余量、( )达到预期加工质量A.不可以B.基本C.可以D.以上都不对
[问答题]施工组织总设计中,施工部署和施工方案的主要内容有哪些
[单选题]关于PLC.下列观点哪个正确?A.PLC与变频器都可进行故障自诊断B.PLC的输入电路采用光电耦合方式C.PLC的直流开关量输出模块又称为晶体管开关量输出模块,属无触点输出模块D.以上全正确
[问答题]请将下列程序横线处缺少的部分补上,使其能正确运行.30.将数组a中元素按下图循环左移一位并输出. a[0] a[1] a[2] a[3] a[4]执行前12345执行后23451# includevoid main ( ){ int j,k,a[5]={1,2,3,4,5}；k=a[0]；for(j=0；j<5；j++)a[j]= ；／*第一空*／a[4]= ；／*第二空*／for ( j=0;j<5；j++)printf (“%5d’’, )；／*第三空*／printf (“\n’’)；}
[单选题]建设和谐文化是构建和谐社会的重要条件,建设和谐文化的根本是( )A.建设社会主义新农村B.构建社会主义核心价值体系C.加强党的先进性建设和执政能力建设D.建立合理的收入分配制度
[单选题]阶级社会发展的直接动力是( )A.社会基本矛盾B.物质资料生产方式C.阶级斗争D.科学技术的发展
[多选题]在记帐凭证会计核算形式下,总帐登记的依据是( )A.原始凭证B.收款凭证C.原始凭证汇总表D.付款凭证
[多选题]励磁调节器中的辅助控制对( ) 具有极重A.提高系统稳定B.提高励磁系统稳定性C.保护发电机的安全运行D.保护变压器的安全运行
[单选题]关于面向对象的继承,以下选项中描述正确的是A.继承是指一个对象具有另一个对象的性质B.继承是指一组对象所具有的相似性质C.继承是指类之间共享属性和操作的机制D.继承是指各对象之间的共同性质
[多选题]三相交流异步电机改善磁场质量时,可以采用( )A.长距分布绕组B.集中绕组C.电源质量高些D.短距绕组
[阅读理解]As protector of her family.s health,the poineer woman confronted situations she never imaginedbefore crossing the Mississippi.Few women came West prepared to deal with desert sunburn,rattlesnake bites,or arrow wounds.Even when doctors were available,they were often no moreknowledgeable than their patients.And most patent(专利)medicines were no more reliable than theitinerant(巡游)merchants who sold them.In certain cases,a woman could draw upon the folk wisdom and remedies she had learned backhome;Western mosquitoes,for example,proved to be as repelled by a paste of vinegar and salt as weretheir Eastern cousins.More often,however,a woman wasguided only by her own ingenuity inconcocting(调制的)tonics(补药),powders,poisons,and polishes from whatever she had at land:salt made a passable toothpaste,gunpowder was applied to wants,and turpentine to open cuts,goose grease,skunk oil,and the ever present lardwere basic liniments;medicinal teas and tonics wenbrewed from sunflower seeds and roots.36.Which of the following statements best expresses the main idea of the passage A.Many people who went West were doctors.B.Medicine and the people who sold it were not reliable.C.Many pioneer women died from bites inflicted by snakes and mosquitoes.D.Pioneer women had to invent their own remedies when they moved West.37.According to the passage,whywere doctors in the West sometimes unable to help theipatients A.They did not know how to treat the unfamiliar illnesses.B.They were more interested in establishing practices in the cities.C.They were more concerned with doing research than with treating patients.D.They were often overcome by diseases caught from their patients.38.Which of the following can be inferred from the passage about patent medicines A.They did not cost much.B.They helped heal snake bites.C.They did not work very well.D.They had a strong taste.39.It can be inferred that most of the pioneers referred to in the passage were originally from wherein the United States A.The desert.B.The West.C.The State of Mississippi.D.The East.40.As used in line 8,the wordcousinsrefers toA.similar medicinesB.mosquitoes in the EastC.people with the same beliefsD.family members in the WestPassage Three
[问答题]研究导体和电气设备的发热有何意义?长期发热和短时发热有何特点
[问答题]百货商店、超级市场、便利店、专业店这四种零售业态的竞争优势是什么
[多选题]在代理中,通常涉及三方关系 )A.代理人B.利益相关人C.被代理人D.第三人
[单选题]在绘制直线时,可以使用以下快捷输入方式( )A.C.B.LC.PAND.E
[单选题]企业文化具有不同的表现形式,其中,企业文化的核心是A.企业价值观B.企业形象C.企业核心产品D.企业制度
[名词解释]什么是ISP