单选题已知级数与反常积分均收敛，则p的取值范围是A.p＞2．B.p＜2．C.p＞0．D.0＜p＜2．

单选题若函数y=x3+1，则等于______。A．B．3x2C．2xD．

单选题I'm sorry to inform you that your application has been declined. Our manager thought you were not ______ for the post. A. cooperative B. eligible C. intelligible D. sensitive

单选题马克思主义政治经济学的研究对象是______。 A．社会生产力及其发展规律 B．社会生产关系及其发展规律 C．物质资料的生产过程 D．生产力和生产关系统一的生产方式

单选题设函数F(u，v)具有一阶连续偏导数，且确定隐函数z=z(x，y)，则=A．．B．．C．．D．．

单选题下列极限存在的是______A．B．C．D．

单选题微分方程y"+9y=x+cos3x的特解可设为

单选题设在区间[a，b]上f(x)＞0，f"(x)＜0，f"(x)＞0，令则______．

单选题若用浓度为30%和20%的甲、乙两种食盐溶液配成浓度为24%的食盐溶液500克，则甲、乙两种溶液各取______．

单选题直线y=x+k与曲线恰有一个公共点，则k的取值范围是______

单选题一列客车长250m，一列货车长350m，在平行的轨道上相向行驶，从两车头相遇到两车尾相离经过15s，已知客车与货车的速度之比是5:3。问两车的速度相差______。

单选题函数y=4x的图像与直线y=4的交点坐标为

单选题In promising to fuse media as diverse as television, telephone communication, video games, music and data transmission, the era of digital convergence goes better than yesterday's celebrated "information superhighway". Yet achieving this single technology is far from straightforward. There are currently three major television broadcast standards, and they are all incompatible with each other. But this is nothing compared to the many technologies supporting the Internet, each with a different bandwidth and physical media. The problems faced in designing platforms and communication systems that will be accepted across the world can appear insuperable. Even once global standards are assured, however, a further obstacle lies in wait. The Internet is plagued by long, erratic response times because it is a pull-technology, driven by patterns of user demands. Push technology, on the other hand, reverses the relationship: servers simply send information to passive users, as in television and radio. But if some form of combination between one-way television flow and interactive Internet is to be the basis of our future media, it is hard to see how it could be operated. Moreover, the problem of fusing Internet with television is also one of defining the services offered. Information, entertainment and relaxation appear at first to be quite different needs. Serious doubts remain over whether consumers will be interested in having to make the sort of mental effort associated with computing while also settling down in front of a sitcom. Besides the issue of consumer habits, infrastructure costs are set to be immense, and will have to be met by national states or the private sector before being passed on to users. Platforms do not necessarily have to be expensive. The mobile phone is a good example of how something that is technologically sophisticated can almost be given away, with its cost recovered through service charges. Users are then coerced through clever marketing to upgrade to newer phones with more features to reinforce their dependence. Whatever the outcome, it is obvious that technology will play an increasing part in our everyday lives. Beyond technology, digital convergence embraces the services, industrial practices and social behavior that form modern society. We have in our hands the technology to construct the most sophisticated machines ever built, but if they are unusable, simply because of their operating instructions, then recent lessons have taught us they will not survive. Whatever we design must be simple, reliable and useful. Perhaps this is where artificial intelligence will come in.

单选题______．A．1B．0C．D．

单选题甲、乙、丙三人独立向目标射击，击中目标的概率分别为．现在他们同时开枪向目标射击一次，则恰有两发子弹击中目标的概率是()．

单选题下列函数中____在点x=0处可导。A．B．e-xC．|x|D．|sinx|

单选题公司有职工50人，理论知识考核平均成绩为81分，按成绩将公司职工分为优秀与非优秀两类，优秀职工的平均成绩为90分，非优秀职工的平均成绩是75分，则非优秀职工的人数为______．

单选题铁路旁的一条平行小路上，有一行人与一骑车人同时向南行进。行人速度为3.6km/h，骑车人速度为10.8km/h。这时有一列火车从他们背后开过来，火车通过行人用22s，通过骑车人用26s。这列火车的车身总长是______m。

单选题设，则下列向量是A的特征向量的是