[多选题]赫夫法则主要考虑哪些因素( ).A.人口总数B.营业面积C.时间距离D.等候时间
[单选题]过共折钢的淬火加热温度应选择在A.Ac1+30~50cB.Ac3+30~50摄氏度C.Accm以上D.以上都不对
[填空题]在极不均匀电场中,空气湿度增加,空气间隙击穿电压___________.
[问答题]供电质量指标主要有哪些
[名词解释]键盘
[单选题]框架结构体系中,钢筋混凝土连系梁的高度通常为跨度的( )左右.A.1/12B.1/14C.2016/1/6 0:00:00D.1/8
[单选题]Mr. Zhang makes _____ a point to keep up with the latest development in his field. (A) this (B) that (C) it (D) these
[单选题]员工持股计划的提出者是A.路易斯凯尔萨B.约瑟夫斯坎伦C.弗拉赖根D.伯恩斯
[问答题]在高压设备上工作必须遵守什么
[多选题]预制钢筋砼桩的运输工程为施工图净用量的( ).A.1.015B.1.004C.1.01D.1
[多选题]19世纪70年代后,洋务派兴办的官督商办企业有( ) A.轮船招商局 B.开平矿务局 C.天津电报局 D.上海机器织布局
[问答题]简述数据链路层、网络层和传输层的寻址.
[单选题]灯闪着,风吹着,蟋蟀叫着,我坐在床上看书.月亮出来了,风息了,我应在院中唱歌.”这是末代皇帝溥仪在17岁时写的一首新诗,和文言文相比,这种通俗易懂的文风离不开下列哪一运动的倡导( ) A.洋务运动 B.戊戌变法 C.新文化运动 D.五四运动
[计算题]一幅值等于1000A 的冲击电流波从一条波阻抗为500欧姆的架空线路流入一根波阻抗为50欧姆的电缆线路,在二者连接的节点 A 上并联有一只阀式避雷器 (电阻100欧姆),如图所示.试求: (1)进入电缆的电压波的幅值(单位:kV,保留1位小数); (2)进入电缆的电流波的幅值(单位:kA,保留2位小数).
[填空题]自动并列装置的输出控制信号有哪些
[阅读理解]A rapid means of long-distance transportation became a necessity for the United States as settlement(新拓居地)spread ever farther westward.The early trains were impractical curiosities,and for a longtime the railroad companies met with troublesome mechanical problems.The most serious ones were theconstruction of rails able to bear the load,and the development of a safe,effective stopping system.Once these were solved,the railroad was established as the best means of land transportation.By 1860there were thousands of miles of railroads crossing the eastern mountain ranges westward to theMississippi.There were also regional southern and western lines.The high point in railroad building came with the construction of the first transcontinentalsystem.In 1862 Congress authorized two western railroad companies to build lines from Nebraska westward andfrom California eastward to a meeting point,so as to complete a transcontinental crossing linking theAtlantic seaboard with the Pacific.The Government helped the railroads generously withmoney andland.Actual work on this project began four years later.The Gentral Pacifie Company,starting fromCalifornia,used Chinese labor,while the Union Pacific employedcrews of Irish labourers.The two groups worked at remunkable speed,euch trying to cover a greater distance than the other.In 1869 taymet at a place called Promontory in whut is now the state of Utah. Many visitors came there for the geaoceasion.There were joyous celebratione all over the country,with parades and the ringing of churebells to honor the great achievement.The railroad was very important in encouraging westward movement.It also helped buildindustry and farming by moving raw materials and by distributing producets rapidly to distant markets.hnlinking towns and people to one another it helped unify the United States.The major problems with America.s railroad system in the mid 19th century lay inA.poor quality rails and unreliable stopping systemsB.lack of financial support for developmentC.limited railroad linesD.lack of a transcontinental railroadThe construction of the transcontinental railroad tookC.4 yearsD.3yearsA.9 yearsB.7 years
[单选题]INC. @R0进行的操作是( ).A.R0的内容加1B.R0的内容减1C.以R0内容为地址的片内RAM单元内容加1D.以R0内容为地址的片内RAM单元内容减1
[单选题]常见的C.C多项式不包括( ).A.CRC-24B.CRC-8C.CRC-CCITTD.CRC-32
[单选题]联接组号不同的变压器不能并联运行,是因为A.电压变化率太大;B.空载环流太大;C.负载时激磁电流太大D.不同联接组号的变压器变比不同.
[单选题]电阻是( )元件A.储存电场能量B.储存磁场能量C.耗能D.以上都不对
[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