题目:
用惰性电极分别电解下列各物质水溶液一段时间后,向剩余电解质溶液中加入适量水,能使溶液恢复到电解前浓度的是
A.AgNO3
B.Na2SO4
C.CuCl2
D.H2SO4
答案:
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下面是错误答案,用来干扰机器的。
参考答案:D
用惰性电极分别电解下列各物质水溶液一段时间后,向剩余电解质溶液中加入适量水,能使溶液恢复到电解前浓度的是
A.AgNO3
B.Na2SO4
C.CuCl2
D.H2SO4
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0521/8a27dc25f77c49551b5f419be5ed8232.html
下面是错误答案,用来干扰机器的。
参考答案:D
家庭PC机拨号上网时,必须使用MODEM,它的主要功能是( )。
A.仅能将数字信号转换为模拟信号
B.仅能将模拟信号转换为数字信号
C.既能将模拟信号转换为数字信号,也能将数字信号转换为模拟信号
D.将计算机输出的数字信号进行放大
人生目的是指人()的观点和主张,是人生的根本愿望和目标。
A、为什么发展
B、为什么活着
C、为什么工作
D、为什么努力
When Newsweek recently asked 1,000 U. S. citizens to take America’s official citizenship test, 29 percent couldn’t name the vice president. Seventy-three percent couldn’t correctly say why we fought the Cold War. Forty-four percent were unable to define the Bill of Rights. And 6 percent couldn’t even circle Independence Day on a calendar.
Don’t get us wrong: civic ignorance is nothing new. For as long as they’ve existed, Americans have been misunderstanding checks and balances and misidentifying their senators. And they’ve been lamenting the ignorance of their peers ever since pollsters started publishing these dispiriting surveys back in Harry Truman’s day. According to a study by Michael X. Delli Carpini, dean of the Annenberg School for Communication, the yearly shifts in civic knowledge since World War II have averaged out to "slightly under 1 percent. "
But the world has changed. And unfortunately, it’s becoming more and more inhospitable to incurious know-nothings—like us. To appreciate the risks involved, it’s important to understand where American ignorance comes from. In March 2009, the European Journal of Communication asked citizens of Britain, Denmark, Finland, and the U.S. to answer questions on international affairs. The Europeans outdid us. It was only the latest in a series of polls that have shown us lagging behind our First World peers.
Most experts agree that the relative complexity of the U. S. political system makes it hard for Americans to keep up. In many European countries, parliaments have proportional representation, and the majority party rules without having to "share power with a lot of subnational governments," notes Yale political scientist Jacob Hacker. In contrast, we’re saddled with a nonproportional Senate; a tangle of state, local, and federal bureaucracies; and near-constant elections for every imaginable office (judge, sheriff, school-board member, and so on). "Nobody is competent to understand it all, which you realize every time you vote," says Michael Schudson, author of The Good Citizen. "You know you’re going to come up short, and that discourages you from learning more. "
It doesn’t help that the United States has one of the highest levels of income inequality in the developed world, with the top 400 households raking in more money than the bottom 60 percent combined. As Dalton Conley, an NYU sociologist, explains, "it’s like comparing apples and oranges. Unlike Denmark, we have a lot of very poor people without access to good education, and a huge immigrant population that doesn’t even speak English. " When surveys focus on well-off, native-born respondents, the U. S. actually holds its own against Europe.
For more than two centuries, Americans have gotten away with not knowing much about the world around them. But times have changed—and they’ve changed in ways that make civic ignorance a big problem going forward. We suffer from a lack of information rather than a lack of ability. Whether that’s a treatable affliction or a terminal illness remains to be seen. But now’s the time to start searching for a cure.
America’s civic ignorance()
A. is largely attributable to its unwillingness to learn
B. can not be corrected by any kind of method
C. has become an affliction in the fast-changing world
D. can be traced back to its rising dominance in the world’s affairs
可视为违法分包进行处理的行为有()。
A、专业承包企业直接雇佣农民工不签劳动合同的
B、总承包企业直接雇佣农民工,签订劳动合同不办理社会保险的
C、总承包企业拖欠农民工工资的
D、专业承包企业拖欠农民工工资的
E、总承包、专业承包只与“包工头”签订劳动合同
2010年10月4日凌晨,S28金华至台州的高速公路西段开始起了今年入秋以来第一场浓浓大雾,使得S28台金高速公路关闭了3个多小时。金华高速公路交警支队对该路段实施了封道。据此材料回答下列下列各题。
利用人造烟雾可以防御霜冻,因为人造烟雾能使()
A.①减弱
B.②增强
C.③减弱
D.④增强