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1.
题目 A、B、C、D、E、F都是常见的化合物，其中A、D是盐，E是酸．在溶液中它们相互间可发生如下反应：
①C＋E=A＋2F
②2B＋E=D＋2F
③A＋2B=C↓＋D 相似文献
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1.常见物质的推断题例1（2010年兰州）有A、B、C、D、E、F六种物质,已知A为一种氯化物,B为一种钠盐,C为一种碱,D为一种常见的气体.它们之间有如下关系：①A和B的溶液混合无明显现象.②B和C的溶液混合生成不溶于稀硝酸的白色沉淀E.③A和C的溶液混合有蓝色沉淀生成.④把D通入C的溶液中有白色沉淀F生成, 相似文献
3.
顾刚 《中学生数理化(高中版)》2005,(15)
题目根据下列反应框图填空.已知B、D、E、L常温下为密度比空气大的气体,D、E为单质,其他为化合物.A是一种淡黄色固体,C在水中的溶解度随温度的升高而减小,F、G均能与L 的水溶液反应放出B. 相似文献
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目的：探讨生姜醇提物对糖尿病小鼠肾损害的保护作用。方法：将30只KM种雄性小鼠随机分为三组,正常对照组（C组,n=10）、模型组（DM组,n=10）及生姜醇提物干预组（ZGB组,n=10）。DM组及ZGB组小鼠尾静脉注射2％四氧嘧啶（90mg／kg）建立糖尿病肾损害模型。造模成功后,ZGB组给予生姜醇提物溶液0．5mL（300mg／kg·d）灌胃14d,DM组及C组给予生理盐水灌胃。14d后小鼠断头取血,测定血糖、血清肌酐、尿素氮含量,检测肾组织丙二醛（MDA）及超氧化物歧化酶（SOD）活力的变化,光镜下观察肾组织病理学改变。结果：与DM组比较,ZGB组血糖、血肌酐及尿素氮水平明显低于DM组（P〈0．01）;肾组织MDA含量明显低于DM组（P〈0．01）,而T—SOD活力则较DM组升高（P〈0．01）。光镜下ZGB组肾脏组织形态学的异常改变较模型组减轻。结论：生姜醇提物对糖尿病小鼠的肾损害有一定的保护作用。 相似文献
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刘静 《陕西教育学院学报》2012,(3):87-89
为了研究杜仲叶提取物对力竭运动及恢复小鼠的抗疲劳作用,选取72只ICR小鼠随机分为安静对照组A、安静杜仲叶提取物组B、力竭运动对照组C、力竭运动杜仲叶提取物组D、力竭运动恢复对照组E和力竭运动恢复杜仲叶提取物组F,每组12只,各给药组小鼠每日按1.5g生药/kg体重剂量以杜仲叶提取物灌胃,各对照组小鼠以蒸馏水灌胃,连续30d后,将C组、D组、E组和F组小鼠置于水中游泳至力竭,记录力竭运动时间。C组和D组小鼠运动后即刻取肝脏、心脏、股四头肌备用。A组和B组不做运动处理,直接取肝脏、心脏、股四头肌备用。E组和F组小鼠恢复24h后取肝脏、心脏、股四头肌备用。测定小鼠肝脏、心脏、股四头肌SOD、POD活性和MDA含量。显示杜仲叶提取物可以提高力竭运动及恢复状态下小鼠肝脏、心脏、股四头肌中SOD、POD活性,减少MDA生成。表明杜仲叶提取物对力竭运动及恢复小鼠有抗疲劳作用。 相似文献
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题目A、B、C、D、E五瓶透明溶液分别是HCl、BaCl2、NaHSO4、Na2CO3和AgNO3溶液的一种．已知：①A与B反应时有气体生成：②B与C反应时有沉淀生成；③C与D反应时有沉淀生成；④D与E反应时有沉淀生成：⑤A与E反应时有气体生成；⑥在反应②和③中生成的沉淀是同一种物质． 相似文献
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三、最短路线问题例1 如图,在等腰△ABC中,CD是底边AB上的高,E是腰BC的中点,AE交CD于F,现在给出三条路线: (a)A→F→C→E→B→D→A; (b)A→C→E→B→D→F→A; (c)A→D→B→E→F→C→A,设它们的长度分别为L(a)、L(b)、L(c),那么下列三种关系式:L(a)相似文献
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陈辉 《语文世界(高中版)》1998,(1)
在下列各题成语的横线上分别］上一组同音词。1．A完归赵B坚清野C．退三舍D．失之交2．A登造极B．针相对C．火连天D拥而上3A轻歌舞B藏海盗C．不经心D．不不枝4．A．目不及B．白壁微C．云蒸蔚D．追闻名5．A买还珠B．连篇累C．穷兵武D．老牛改E．囊萤照6．A胜任快BE互见C．不可逆D．忠贞不E．桑喜景7．A满腹经Bbfi老手C、无与比D囫吞枣E．肌使髓百．A口笔伐B．联壁合C．错必较D．丝马迹E．儒观戏9．A通达百B,九云外C．遥自在D．声匿迹E．烟云散10．A七八落B．八面改C．牙俐齿D．掩耳盗E．高屋建11．A穷困倒B星火原C．青… 相似文献
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陈昭亮 《数理天地(高中版)》2002,(3)
基本图形如图1.△ABC的高AD、BE、CF交于H,连结DE、EF、DF,这是一个颇为重要的图形,因为有以下的结论(1)6组四点共圆:①B、D、H、F;②D、C、E、H;③E、A、F、H;④F、B、C、E;⑤D、C、A、F;⑥E、A、B、D. 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
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Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献