Mineral powder separator

7. It can be seen from the figure that the electric field direction in the ore separator is horizontally to the left. < br > a. the positively charged ore powder will fall to the left because of the horizontal left electric field force, and option a is wrong. < br > B. No matter what electricity the ore powder carries, it will shift along the direction of the electric field force in the horizontal direction under the action of the electric field force, and the displacement is the same as the direction of the electric field force, Option B is wrong < br > C, the electric field force of the ore powder with negative charge does positive work, so the electric potential energy is reced, option C is wrong. < br > D, the electric field force of the ore powder with positive charge does positive work, so the electric potential energy is reced, and option D is correct. < br > therefore, option D is selected

8. Quality ecation
in today's society, ecation, media and officials are always talking about quality ecation. It seems that we can't show our level without talking about it, but what are we actually doing? On the surface, they are benevolent, righteous and moral, but on the back, they are stealing men and prostitutes. This is too harsh to use here, but I really can't think of how to use elegant words to describe it. To paraphrase Lu Xun's words, I am a little angry

when my son was just in the third grade, I prepared some books for him, such as the online encyclopedia. I seldom read 100000 whys, idioms and stories, fairy tales and masterpieces. I don't want to read them. I really don't have time to read them. Every day after school, we have to start doing homework. Generally, we have to do it for two or three hours, sometimes more than four hours. All of them are mechanical writing. We have no time to read extracurricular books, let alone listen to music or play games. My son still likes reading books. Last semester, he was just rated as a scholarly family by the school, so he was very interested in writing diary and composition. But is this childhood buried in homework too cruel for a child. Because of more homework, children's favorite piano and English should often give in to it. Look around, many parents are like this, they have to complain. This is the state's exam oriented ecation. After all, the phenomenon of Zheng Yuanjie taking children home to teach by himself is a phenomenon that we can only look up to

you just need to do a good job in quality ecation, but the big lever of your exam oriented ecation will not change. Is this not empty talk, but it can't do it. That is to say, you have to make a show, and then you shout to lighten the burden, and to strengthen quality ecation every day, but the children's schoolbag is still heavy, A few days ago, I weighed my son's schoolbag 3.5kg, asked about this, said to use it, took away that, said no, reced the load for half a day, only reced a few pieces of papyrus, I sighed helplessly. There are a lot of courses in the school, most of which are not given books. I understand the difficulties of the school. However, I am angry that I teach my children so much homework every day that they say that if someone asks if they have homework, they should say no loudly. Isn't it intentional to teach children to lie

some newspapers say that the X in Shandong's 3 + X is a combination of art and sports. My God, the art and sports fever that has been hot for several years may reach a new climax in the shaking of the baton of the college entrance examination. Don't those training classes and tutorial classes break through the threshold? Maybe these decision-makers must be beautiful. How smart we are to let students learn culture well and improve their artistic quality. Kill two birds with one stone, ha ha

there was a cloze question about super girl Zhang Hanyun in this year's Liaoning senior high school entrance examination English paper, together with two things that Liu Xiang, the Olympic champion of last year, appeared in Shanghai textbooks. I dare not say that this is about the decision-makers taking quality ecation as an example. The comments on the Internet are also quite different. At least the impact of these two events is not small, It's not necessary to guess how many children will be affected by Ding Junhui's efforts to learn how to play billiards and win the world championship. However, these two incidents have great lethality. Some experts say that "this is just the thinking of the problem maker, whose purpose is to stimulate students' interest in answering questions. However, it is kitsch to cater to students' taste in examination questions and teaching materials. "<

some time ago, retired officials of the Ministry of ecation made a great response. Their astonishing reports caused quite a stir. It was only then that we people did not have any opinions on the current situation of ecation. The officials in office are also well-informed, but they dare not say it. Anyway, when they retire, they will not talk about it. This phenomenon is quite strange. Many people have their own opinions on the system. Even the policy makers are not satisfied with it. Should the so-called "quality ecation" be changed

although I am a mechanical teacher, as the deputy head teacher of electronic class 061, I assigned a task to the whole class, that is, I have to hand in a manuscript for practicing calligraphy every week. After I handed in the monitor's article for the first time, I was very puzzled, because his article was very long, but "de", "Di" and "de" were all used in the whole article, regardless of adverbs, verbs, nouns, coordinate sentences and parallelism sentences, but they were all misused. In particular, punctuation does not have colons, double quotes, or even colons. It should be said that he has themes and examples, but why is it so nonstandard? With this doubt, I called him to have a conversation. As a result, he told me, "in the fourth grade of primary school, the Chinese teacher said that we should carry out quality-oriented ecation. When we write compositions, we should let ourselves write according to our feelings. The more we write, the better. Basically, it's as encouragement. We don't point out what's wrong with us, but praise as long as we have enough, So now it's definitely no problem to ask me to write a lot of words, and I will write a lot unconsciously. But it's all teachers. You see, it's not standard. "
the practice of blindly publicizing and discarding critical ecation is not quality ecation, but a biased ecational behavior. In the narrow definition of pedagogy, there is the article of "using standardized language to express". Writing an article still needs to communicate with people. If the language is not standardized, the purpose of communication can not be achieved. Of course, this example may only be the behavior of indivial teachers. I hope teachers will consider it well before they flaunt quality ecation and never discredit it

Quality Ecation: the emperor's new clothes

in daily life, people are willing to choose to do something, an important reason is that people think that doing this thing will bring them some benefits, so as to meet their needs. Ecation is playing an expected role in personal and social life. Therefore, when the huge investment in ecation fails to bring the expected benefits, the high expectation of ecation will inevitably bring high disappointment. And this disappointment is not just from parents

nowadays, quality ecation is advocated, which stresses "only teachers who can't teach well, no students who can't teach well", "students have no mistakes", "students are not allowed to be expelled" and so on, so that teachers can't let go of their hands to ecate students, and quality ecation is reced to "accommodating ecation"

the school implements the system of students scoring teachers. As a result, no matter what, their teachers actually get the first vote! And those teachers who are conscientious in their posts are constantly accused by students.

9. It can be seen from the figure that the electric field direction in the ore separator is horizontally to the left. < br > a. the positively charged ore powder will fall to the left because of the horizontal left electric field force, and option a is wrong. < br > B. No matter what electricity the ore powder carries, it will shift along the direction of the electric field force in the horizontal direction under the action of the electric field force, and the displacement is the same as the direction of the electric field force, and the electric field force does positive work, Option B is correct < br > C, the electric field force of the ore powder with negative charge does positive work, so the electric potential energy is reced, and option C is wrong. < br > D, the electric field force of the ore powder with positive charge does positive work, so the electric potential energy is reced, and option D is correct. < br > therefore, BD is selected

10. A The direction of the electric field line is to the left, so the positive object is forced to the left and falls to the left. Error
B. When an object is accelerated, it is the electric field force that does positive work on it. Right< br />C When the object is accelerated, the kinetic energy increases, the energy is conserved, and the electric potential energy must decrease. Wrong< br />D When the object is accelerated, the kinetic energy increases, the energy is conserved, and the electric potential energy must decrease. Right
this question is BD
hope to adopt.