下列粒子中既无中子又无电子的是( ) A.H B.H+ C.H2 D.O

题型:选择题

问题:

下列粒子中既无中子又无电子的是(  )

A.H

B.H+

C.H2

D.O

考点:原子结构原子的定义
题型:选择题

患者,男,30岁,因"关节弹响半年,食物嵌塞"就诊,缺牙两年余,已行胶托式RPD修复,义齿密合,固位、稳定可。口内检查,上下颌前牙切缘明显磨耗至约中1/3,后牙功能尖低平,非功能尖尖锐,垂直距离降低,开口弹响,开口度和开口型无明显异常,颞下颌关节薛氏位片示:髁突后移,左右侧无明显异常。

食物嵌塞的可能原因是()

A.相邻牙邻接关系不正常

B.咬合关系不正常

C.咬合形态改变

D.充填体及修复体与邻牙牙冠接触区的位置恢复不当

E.接触区的形态恢复不当

F.牙龈和牙周萎缩

G.不当的咬合习惯

题型:选择题

关于人工流产,正确的是()

A.妊娠10周行钳刮术

B.妊娠10~14周行吸宫术

C.人工流产仅指负压吸宫术

D.带器妊娠不能行人工流产术

E.术后检查吸出物有无绒毛胎囊

题型:选择题

拨打12580能够开通或实现的业务有()。

A、手机杂志

B、代发短信

C、商务之旅

D、修改彩铃

题型:选择题

加速开关电器中灭弧的措施与方法主要有如下几种()。

A.气体纵向吹动电弧

B.气体横向吹动电弧

C.拉长电弧

D.电弧与固体介质接触

题型:选择题

It’s a safe bet that the millions of Americans who have recently changed their minds about global warming--deciding it isn’t happening, or isn’t due to human activities such as burning coal and oil, or isn’t a serious threat--didn’t just spend an intense few days poring over climate-change studies and decide, holy cow, the discrimination of continuous equations in general circulation models is completely wrong! Instead, the backlash (an 18-point rise since 2006 in the percentage who say the risk of climate change is exaggerated, Gallup found this month) has been stoked by scientists’ abysmal communication skills, plus some peculiarly American attitudes, both brought into play now by how critics have spun the "Climategate" e-mails to make it seem as if scientists have pulled a fast one.
Scientists are lousy communicators. They appeal to people’s heads, not their hearts or guts, argues Randy Olson, who left a professorship in marine biology to make science films. "Scientists think of themselves as guardians of truth," he says. "Once they have spewed it out, they feel the burden is on the audience to understand it" and agree.
That may work if the topic is something with no emotional content, such as how black holes forms, but since climate change and how to address it make people feel threatened, that arrogance is a disaster. Yet just as smarter-than-thou condescension happens time after time in debates between evolutionary biologists and proponents of intelligent design (the latter almost always win), now it’s happening with climate change. In his 2009 book, Don’t Be Such a Scientist: Talking Substance in an Age of Style, Olson recounts a 2007 debate where a scientist contending that global warming is a crisis said his opponents failed to argue in a way "that the people here will understand. " His sophisticated, educated Manhattan audience groaned and, thoroughly insulted, voted that the "not a crisis" side won.
Like evolutionary biologists before them, climate scientists also have failed to master "truthiness" (thank you, Stephen Colbert), which their opponent--climate deniers and creationists--wield like a shiv. They say the Intergovemmental Panel on climate Change is a political, not a scientific, organization; a climate mafia (like evolutionary biologists) keeps contrarian papers out of the top journals; Washington got two feet of snow, and you say the world is warming’
There is less backlash against climate science in Europe and Japan, and the U. S. is 33rd out of 34 developed countries in the percentage of adults who agree that species, including humans, evolved. That suggests there is something peculiarly American about the rejection of science. Charles Harper, a devout Christian who for years ran the program bridging science and faith at the Templeton Foundation and who has had more than his share of arguments with people who view science as the Devil’s spawn, has some hypotheses about why that is. "In America, people do not bow to authority the way they do in England," be says. "when the lumpenproletariat are told they have to think in a certain way, there is a backlash," as with climate science now and, never-endingly, with evolution. (Harper, who studied planetary atmospheres before leaving science, calls climate scientists "a smug community of true believers. ")
Another factor is that the ideas of the Reformatio--no intermediaries between people and God; anyone can read the Bible and know the truth as well as a theologia--inform the American character more ply than they do that of many other nations. "It’s the idea that everyone has equal access to the divine," says Harper. That has been extended to the belief that anyone with an Internet connection can know as much about climate or evolution as an expert. Finally, Americans carry in their bones the country’ s history of being populated by emigrants fed up with hierarchy. It is the American way to distrust those who set themselves up-even justifiably--as authorities. Presto: climate backlash.
One new actor is also at work. the growing belief in the wisdom of crowds (Wikis, polling the audience on Who Wants to Be a Millionaire). If tweeting for advice on the best route somewhere yields the right answer. Americans seem to have decided, it doesn’t take any special expertise to pick apart evolutionary biology or climate science. My final hypothesis, the Great Recession was caused by the smartest guys in the room saying, trust us, we understand how credit default swaps work, and they’re great. No wonder so many Americans have decided that experts are idiots.

1.What is the "Climategate" What is the recent debate about global warming

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