在下列选项中，( )是数据库管理系统的基本功能。
Ⅰ、数据库存取
Ⅱ、数据库的建立和维护
Ⅲ、数据库定义
Ⅳ、数据库和网络中其他软件系统的通信，
D.都是

未分类题下列控制指标中属于控制性详细规划规定性指标的是：(1)道路坐标(2)容积率(3)用地性质(4)人口容量(5)交通出入口方位(6)停车泊位(7)建筑面积A.(1)、 (4)、 (7)B.(2)、 (3)、 (5)、 (6)C.(1)、 (2)、 (3)、 (4)D.(1)、 (2)、 (3)、 (4)、 (5)、 (6)、 (7)

未分类题行政区划的基本要素是( )。①一定规模人口和面积的地域空间②一个设有相应行政机构的行政中心③一个具有明确的上下级隶属关系的行政等级④一个与行政建制相对应的行政区名称⑤一个设有与行政机构相应的权力机关D.①③④⑤

多项选择题证券投资基金按照投资对象分为 （ ）。 A、股票基金 B、债券基金 C、货币市场基金 D、指数基金 E、认股权证基金

问答题What can we learn from the two cases mentioned in this video?

未分类题No one (care about) if he (appears) at the meeting next year or not. If (it happens) he will (be made to) apologize for his careless comments.A.care aboutB.appearsC.it happensD.be made

单项选择题激发情感导入一般( )课使用的多。A. 语文B. 数学C. 英语D. 物理

未分类题(The age of) a geological sample can (be estimated) from the ratio of radioactive to nonradioaetive carbon (present) in the object (is examined).A.The age ofB.be estimatedC.presentD.is examined

未分类题It is hard to predict how science is going to turn out, and if it is really good science it is impossible to predict. If the things to be found are actually new, they are by definition unknown in advancE.You cannot make choices in this matter. You either have science or you don't, and if you have it you are obliged to accept the surprising and disturbing pieces of information, along with the neat and promptly useful bits.The only solid piece of scientific truth about which I feel totally confident is that we are profoundly ignorant about naturE.Indeed, I regard this as the major discovery of the past hundred years of biology. It is, in its Way, an illuminating piece of news. It would have amazed the brightest minds of the 18th century Enlightenment to be told by any of us how little we know and how bewildering seems the way aheaD.It is this sudden confrontation with the depth and scope of ignorance that represents the most significant contribution of the 20th century science to the human intellect. In earlier times, we either pretended to understand how things worked or ignored the problem, or simply made up stories to fill the gaps. Now that we have begun exploring in earnest, we are getting glimpses of how huge the questions are, and how far from being answereD.Because of this, we are depresseD.It is not so bad being ignorant if you are totally ignorant; the hard thing is knowing in some detail the reality of ignorance, the worst spots and here and there the not-so-bad spots, but no true light at the end of the tunnel nor even any tunnels that can yet be trusteD.But we are making a beginning, and there ought to be some satisfaction. There are probably no questions we can think up that can't beanswered, sooner or later, including even the matter of consciousness. To be sure, there may well be questions we can't think up, ever and therefore limits to the reach of human intellect, but that is another matter. Within our limits, we should be able to work our way through to all our answers, if we keep at it long enough, and pay attention.According to the author, really good science ______.A.would surprise the brightest minds of the 18th century EnlightenmentB.will produce results which cannot be foreseenC.will help people to make the right choice in advanceD.will bring about disturbing results

未分类题听力原文：W: Exercise, exercise, exercisE.We hear so much about it these days, yet even the experts can't agree on which exercises are best. Now some doctors are strongly encouraging arm exercises.M: Arm exercises? Is that because our arms are too fat or flabby?W: Actually, that's not the main reason. They say that arm exercises are an ideal way to become physically fit.M: But don't arm exercises raise your blood pressure?W: That they do. But the article I read mentioned ways to compensate for that.M: How?W: By adding leg exercises, so the arms don't do all the work. Ann exercises alone aren't enough to increase metabolism before fatigue sets in. The more of the body that's involved in the exercise, the better.M: And in turn, I'm sure that there's a greater chance of losing weight.W: Sounds right to mE.M: So what exercises do the experts recommend?W: They mentioned quite a few but some of the more popular ones are cycling with special bicycles that make you use both your arms and legs, and walking vigorously while you wear arm weights.M: I must try that, I like to walk a lot.(23)A.They don't get rid of flabby arms.B.They can damage arm muscles.C.They aren't acceptable to most peoplE.D.They can raise one's blood pressurE.

单项选择题‍目前，在大型乒乓球赛事中，多采用 和 两个成熟的软件。​ ​