从事科学实验的重要环节是进行科学实验设计.科学实验的正确步骤应为:①明确实验目的

题型:填空题

问题:

从事科学实验的重要环节是进行科学实验设计.科学实验的正确步骤应为:①明确实验目的;②收集有关资料;③设计合理方案;④进行科学实验.请你按照以上四个步骤,完成以下实验设计,根据下图回答问题:

(1)在实验室中用过氧化氢(H2O2)制取氧气.

①[明确实验目的]:用过氧化氢在实验室里制取氧气.

②[收集有关资料]过氧化氢是一种无色液体,在二氧化锰的催化作用下,迅速分解出氧气,其反应的文字表达式为:______.

③[设计合理方案]:发生装置选用______(填序号,下同),收集装置选用______.

(2)在实验室中,可以用加热氯酸钾(KClO3)和二氧化锰固体混合物制取氧气.

①[明确实验目的]:______.

②[收集有关资料]:氯酸钾是白色的固体,二氧化锰是黑色的固体.且二氧化锰在反应中起______作用.

③设计合理方案:发生装置选用______,若选用D收集装置收集氧气,你验证集气瓶中是否已收集满的方法是______.

④[进行科学实验]:…

考点:实验室制取和收集气体的思路催化剂和催化作用化学反应方程式的书写文字表达式
题型:填空题

下列关于法律规则与法律条文关系的表述,能够成立的有()。

A.法律规则是法律条文的表现形式

B.一个法律条文可以表达多个法律规则

C.有些法律条文不表达法律规则

D.一个法律规则可以体现于一个法律条文中

题型:填空题

下列哪类船舶应执行我国现行《海洋环境保护法》的规定()。

Ⅰ.以内航行的任何外国籍船舶;Ⅱ.以外造成我国海域污染的船舶;Ⅲ.以内航行的任何中国籍船舶。

A.Ⅰ~Ⅲ

B.Ⅱ、Ⅲ

C.Ⅰ、Ⅱ

D.Ⅰ、Ⅲ

题型:填空题

D

“Pay has little to do with motivation in the workplace”.That’s the argument put forward by best-selling author Daniel Pink in his new book, Drive: The Surprising Truth About What Motivates Us.“Pay for performance is supposed to be a folk tale,” he says.

Daniel argues that, if employees receive a basic level of payment, three other factors matter more than money: a sense of independence, of mastery over one’s labor, and of serving a purpose larger than oneself.For example, in 2008 at the offices of Best Buy’s Richfield, salaried workers there were allowed to organize their own work day, putting in only as many hours as they felt necessary to get their jobs done.Productivity increased by 35% according to The Harvard Business Review.

But the managers at Goldman Sachs aren’t exactly making some efforts to adjust.Like others on Wall Street, the banking giant argues that fat bonuses (extra rewards) are essential to make its numbers.“That’s exactly the attitude that leads to the recent financial crisis in the United States,” responds Daniel, “as managers always focus on short-term rewards that encourage cheating, shortcuts, and dishonest behavior.”

Moreover, the 45-year-old author and former Al Gore speechwriter refers to social-science experiments and experiences at such workplaces as Google and 3M.In one 2005 experiment he describes, economists working for the Federal Reserve Bank of Boston tested the power of incentives (激励) by offering cash rewards to those who did well in games that included reciting a series of numbers and throwing tennis balls at a target.The researchers’ finding: Over and over, higher incentives led to worse performance --- and those given the highest incentives did the poorest job.

From this and other cases, Daniel draws a conclusion that monetary incentives remove the element of play and creativity, transforming “an interesting task into a dull one.” It’s even possible, he adds, for oversized rewards to have dangerous side effects, like those of a drug dependency in which an addicted requires ever larger amounts.He refers to scientific testing that shows the promise of cash rewards increase a chemical in the brain similar to that brought on by cocaine or nicotine.

Daniel, however, is also aware that his company examples --- no GE, no IBM, no Microsoft --- hardly represent the commanding heights of the economy.But he thinks his approach will catch on, even in the biggest companies.“Managers tend to be realistic, and in time they will respond,” he says.

53.In his book, Drive: The Surprising Truth About What Motivates Us, Daniel Pink is promoting the idea that _____.

A.it is a money-driven society    B.all workers are not driven by money

C.money plays a key role in management  D.pay has nothing to do with workplaces

54.In Daniel’s point of view, many Wall Street managers are _______.

A.dishonest      B.considerate   C.short-sighted       D.ridiculous

55.In paragraph 5, the example of drug-taking is given to show _______.

A.money is as addictive as cocaine or nicotine

B.big rewards bring about dangerous side effect

C.nicotine and money bring the same chemical

D.workers do not need the incentives of money at all

56.We can learn from the last paragraph that _______.

A.Daniel’s approach will be popular in a wider field

B.realistic managers will first consider Daniel’s approach

C.Daniel’s approach meets the demand of economic crisis

D.GE, IBM and Microsoft will join in Daniel’s approach next

题型:填空题

各小组同学到台前介绍自己的设计构思和制作过程,然后进行相互评价,这是()。

A.学生自评

B.同学互评

C.教师评价

D.家长评价

题型:填空题

请根据以下内容回答:
患者,73岁,2小时前晚餐后突感胸骨后剧烈压榨样疼痛,伴大汗、呕吐及濒死感,急诊入院。查心率130次/分,律不齐,血压165/100mmHg,心电图示V1~V4导联ST段呈弓背向上抬高,TN:3.5ng/ml。
患者最可能的诊断为______。

A.高血压脑病
B.高血压危象
C.急性心肌梗死
D.心脏神经官能症
E.肺梗塞

更多题库