题干

为除去混入CO2中的SO2和O2,下列试剂的使用顺序正确的是
①饱和Na2CO3溶液;②饱和NaHCO3溶液;③浓H2SO4溶液;④灼热的铜网;⑤碱石灰

A:①③④

B:②③④

C:②④③

D:③④⑤

上一题 下一题 0.0难度 选择题 更新时间:2016-03-16 11:31:23

答案(点此获取答案解析)

B

同类题2

阅读理解

    Do you still remember your favorite poem from high school or some other important periods in your life?Why is it that decades later it still stands out in your mind?Probably the main reason is that some aspects of that poem resonates(引起共鸣)with you.In the same way,you too as a school leader can touch the hearts of your staff and students.

    Poetry allows us to experience strong spiritual connections to things around us and to the past.Thus,it can inspire whatever and whomever it touches.The power that poetry has displayed over time and across cultures actually satisfies this common need of the human heart and soul.

    As one of the oldest art forms,poetry has successfully connected various strands of humanity(人性)from one generation to another.Referring to poetry,Hillyer makes a simple yet meaningful statement,“With this key mankind unlocked his heart.”

    School leaders can find and make use of the value of poetry for themselves,their students and their staff members.Beyond the simple use of poetry,techniques of poetry such as metaphors,repetitions and imagery can be used to take advantage of the power of language to transform communication,create meaning and a culture of care and attention.

    Since schools are mainly about people and relationship,school leaders,like poets,are required to inspire and encourage the human heart.The use of poetry—or even of some techniques of poetry—in school leadership not only helps to improve communication,but also serves to meet the human need for inspiration.

同类题3

阅读材料,完成下列要求。

经济全球化是当今世界的一大特征,开放是国家繁荣发展的必由之路,我国基本形成了开放型的经济新体制。

材料一 2015年10月29日通过的《中共中央关于制定国民经济和社会发展第十三个五年规划的建议》中指出,全方位对外开放是发展的必然要求,必须坚持打开国门搞建设,既立足国内,又重视国内国际经济联动效应,更好利用两个市场、两种资源;必须顺应我国经济深度融入世界经济的趋势,奉行互利共赢的开放战略,坚持内外需协调、进出口平衡、引进来和走出去并重、引资和引技引智并举,发展更高层次的开放型经济;积极参与全球经济治理和公共产品供给,提高我国在全球经济治理中的制度性话语权,构建广泛的利益共同体,促进国际经济秩序朝着平等公正、合作共赢的方向发展。

材料二 2015年10月5日,美日等12个国家达成“跨太平洋战略经济伙伴协定”(简称TPP)。正式实施该协定后,成员国之间可以取长补短,带来产品和服务价格下降等便利。目前中国尚未加入该协定,从短期看,该协定或对中国的外贸带来一定程度的冲击。美国参议员查尔斯·E·舒默声称TPP既定的目标就是要“引诱”其它国家“远离中国”,奥巴马总统也表示“不能让中国这样的国家书写全球经济规则”。其实TPP并不可怕,有专家甚至指出,我国提出建设“一带一路”、倡导成立“亚投行”等举措,其实质就是反制TPP的。