如图所示,透镜对光的作用正确的是()

题型:选择题

问题:

如图所示,透镜对光的作用正确的是(  )

考点:透镜及其分类
题型:选择题

1.根据课文内容填空。  

1.一身                   的羽毛,一对                             的翅膀, 加上                           的尾巴,凑成了

                                    的小燕子。 青

2.青的                     绿的                      ,各色鲜艳的                                            ,都像赶集似的  

                                     来,                                  了夺目的春天。 

3.在微风中,在阳光中,燕子                              身子在天空中                               过,唧唧地叫着,有的由这边的稻田上,一转眼                         到了那边的柳树下边;有的                      过湖面,尾尖偶尔____了一下水面,就看到波纹一圈一圈地荡漾开去。

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对电流的流向和正负极的规定,下面哪种说法是正确的?()

A.电源和负载都是以电流流入一端为正

B.电源以电流流入一端为正,负载以电流流出一端为正

C.电源以电流流出一端为正,负载以电流流入一端为正

D.电源和负载都是以电流流出一端为正

E.电源内部E的方向从负极指向正极,而负载内部U的方向从正极指向负极

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Questions 1~5


Writing articles about films for The Front Page was my first proper job. Before then I had done bits of reviewing—novels for other newspapers, films for a magazine and anything I was asked to do for the radio. That was how I met Tom Seaton, the first arts editor of The Front Page, who had also written for radio and television. He hired me, but Tom was not primarily a journalist, or he would certainly have been more careful in choosing his staff.
At first, his idea was that a team of critics should take care of the art forms that didn’t require specialized knowledge: books, TV, theatre, film and radio. There would be a weekly lunch at which we would make our choices from the artistic material that Tom had decided we should cover, though there would also be guests to make the atmosphere sociable.
It all felt a bit of a dream at that time: a new newspaper, and I was one of the team. It seemed so unlikely that a paper could he introduced into a crowded market. It seemed just as likely that a millionaire wanted to help me personally, and was pretending to employ me. Such was my lack of self-confidence. In fact, the first time I saw someone reading the newspaper on the London Underground, then turning to a page on which one of my reviews appeared, I didn’t know where to look.
Tom’s original scheme for a team of critics for the arts never took off. It was a good idea, but we didn’t get together as planned and so everything was done by phone. It turned out, too, that the general public out there preferred to associate a reviewer with a single subject area, and so I chose film. Without Tom’s initial push, though, we would hardly have come up with the present arrangement, by which I write an extended weekly piece, usually on one film.
The space I am given allows me to broaden my argument—or forces me, in an uninteresting week, to make something out of nothing. But what is my role in the public arena I assume that people choose what films to go to on the basis of the stars, the publicity or the director. There is also such a thing as loyalty to "type" or its opposite. It can only rarely happen that someone who hates westerns buys a ticket for one after reading a review, or a love story addict avoids a romantic film because of what the papers say.
So if a film review isn’t really a consumer guide, what is it I certainly don’t feel I have a responsibility to be "right" about a movie. Nor do I think there should be a certain number of "great" and "bad" films each year. All I have to do is put forward an argument. I’m not a judge, and nor would I want to be.

What does the author mean when he says that Tom’s scheme "never took off" (para. 4) ______

A. It was unpopular.
B. It wasted too much time.
C. It wasn’t planned properly.
D. It wasn’t put into practice.

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软件生命周期一般可分为以下阶段:问题定义、可行性研究、 【3】 、设计、编码、 【4】 、运行与维护。

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自动化立体仓库是无需人工操纵机器进出货物的仓库。( )

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