[判断题]同步电机中,空载电动势或空载电压就是由主磁极产生的电动势,无论空载 或负载,只要转速恒定,励磁电流不变,空载电动势就不变.
[单选题]测定点的平面坐标的主要工作是( ). A.测量水平距离 B.测量水平角 C.测量水平距离和水平角 D.测量竖直角
[判断题]三极管的交流放大倍数和直流放大倍数是两个不同的概念,但其值近似相等.
[单选题]构成建筑物的基本要素中( )体现着建筑物的目的性. A 建筑功能 B 物质技术条件 C 建筑形象 D 建筑经济性
[单选题]_____是住宅建筑采用的组合方式 A.单一体型 B..单元组合体型 C.复杂体型 D.对称体型
[多选题]差分放大电路的差模信号是两个输入端信号的 ,共模信号是两个输入端信号的 . A、 差 B、 和 C、 平均值
[多选题]钢结构构件焊接焊缝固体夹渣的主要原因是A.焊接速度太快B.焊接电流太大C.焊接材料质量不好D.焊接材料质量不好
[判断题]正弦量的三要素是指最大值.角频率和相位.
[阅读理解]Amtrak (美国铁路客运公司)was experiencing a downswing in ridership (客运量)along the lines comprising its rail system. Of major concern to Amtrak and its advertising agency DDB Needham, were the long-distance western routes where ridership had been declining significantly. ]At one time, trains were the only practical way to cross the vast areas of the west. Trains were fast, very luxurious, and quite convenient compared to other forms of transportation existing at the time. However, times change and the automobile became America‘s standard of convenience. Also, air travel had easily established itself as the fastest method of traveling great distances. Therefore, the task for DDB Needham was to encourage consumers to consider other aspects of train travel in order to change their attitudes and increase the likelihood that trains would be considered for travel in the west. Two portions of the total market were targeted:1)anxious fliers―those concerned with safety, relaxation, and cleanliness and 2)travel-lovers―those viewing themselves as relaxed, casual, and interested in the travel experience as part of their vacation. The agency then developed a campaign that focused on travel experiences such as freedom, escape, relaxation, and enjoyment of the great western outdoors. It stressed experiences gained by using the trains and portrayed western train trips as wonderful adventures. Advertisements showed pictures of the beautiful scenery that could be enjoyed along some of the more famous western routes and emphasized the romantic names of some of these trains (Empire Builder, etc. ). These ads were strategically placed among family-oriented TV shows and programs involving nature and America in order to most effectively reach target audiences. Results were impressive. The Empire Builder, which was focused on in one ad, enjoyed a 15 percent increase in profits on its Chicago to Seattle route. 1.What‘s the author‘s purpose in writing this passage? 【外语教育&网www.for68.com】 A) To show the inability of trains to compete with planes with respect to speed and convenience. B) To stress the influence of the automobile on America‘s standard of convenience. C) To emphasize the function of travel agencies in market promotion. D) To illustrate the important role of persuasive communication in changing consumer attitudes. 2.It can be inferred from the passage that the drop in Amtrak ridership was due to the fact that ________. A) trains were not suitable for short distance passenger transportation B) trains were not the fastest and most convenient form of transportation C) trains were not as fast and convenient as they used to be D) trains could not compete with planes in terms of luxury and convenience3.To encourage consumers to travel by train, DDB Needham emphasized ________.A) the freedom and convenience provided on trainsB) the practical aspects of train travelC) the adventurous aspects of train tripsD) the safety and cleanliness of train trips 4.The train ads were placed among family-oriented TV programs involving nature and America because ________.A) they could focus on meaningful travel experiencesB) they could increase the effectiveness of the TV programsC) their profits could be increased by some 15 percentD) most travel-lovers and nervous fliers were believed to be among the audiences5.According to the passage, the Empire Builder enjoyed an increase in ridership and profits because ________.A) the attractiveness of its name and route was effectively advertisedB) it provided an exciting travel experienceC) its passengers could enjoy the great western outdoorsD) it was widely advertised in newspapers and magazines in Chicago and Seattle
[判断题]当受控源的控制量与被控制量在同一支路时,受控源则表示为电容.
[判断题]广播地址是网络地址中主机位全部置为1的一种特殊地址,它也可以做为主机地址使用.
[单选题]下列( )项不是技术资料准备内容. A.社会劳动力调查 B.熟悉和会审图纸 C.编制施工图预算 D.编制施工组织设计
[单选题]变压器参数BT由试验数据( )确定.A B C D
[填空题]卡托普利分子结构中具有下列哪一个基团
[问答题]气体反应的碰撞理论的要点是
[单选题]在自动取款机上,客户只能对自己的账户进行查询、存取款、转账等操作,客户面对的数据模型是( )A. 概念模型B. 逻辑模型C. 外部模型D. 内部模型
[多选题]在超高压输电线路上一般要装设并联高压电抗器,其作用包括( )A.限制工频电压升高 B.降低操作过电压C.消除发电机带长线出现自励磁 D.避免长距离输送无功功率并降低线损
[单选题]This company should be able to ___________ our requirements.得分/总分 A. take B. do C. make D. fulfill
[单选题]对心曲柄滑块机构的行程速比系数一定( )A. 大于1B. 等于1C. 小于l
[判断题]比率能够综合反映与比率计算相关的某一报表的联系,但给人们不保险的最终印象.
[多选题]以下关于OSPF的Router ID描述不正确的是( ). A、在同一区域内Router ID必须相同,在不同区域内的Router ID可以不同B、Router ID必须是路由器某接口的IP地址C、必须通过手工配置方式来指定Router IDD、OSPF协议正常运行的前提条件是该路由器有Router ID