共查询到20条相似文献，搜索用时 62 毫秒
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《中学生数理化(高中版)》2007,(3)
数学在△ABC中,已知cosA=5/13, sinB=3/5,则cosC=____．A．16/65 B．56/65 C．16/65或56/65 D．-16/65错解:由cosA=5/13,得sin A=12/13．又sin B=3/5,得cos B=±4/5．当cos B=4/5时, 相似文献
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一、直接推理法例1如图1所示，一只固定电阻RI一60O．和一又变阻器从一100n·把它们串联在电压U—32Af的电源上组成电路．滑片P在不同位置上时，在几上分得的电压最大值和最小值分别为：（）A．32V，OV；B‘32V．ZOAf；C．20V．OV；D．20V．12V分析因两电阻串联．R；上的电压不可能达到32V，故A、B可以排除，又因滑片P在最左端时，R。接入电路的电阻为零，所以It上分得电压必然为oV，故选C．二、等效思维法例2电阻ICI—l／3n，ICZ一1／70，入。一1／10fi．并联后的总电阻为：（）A．ZOo；B．1／ZOfl；C．回／21OQ；D．无… 相似文献
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刘定发 《数理天地(高中版)》2010,(5):28-29
例1 如图1,A、B、C、D是匀强电场中一个正方形的四个顶点,已知A、B、C三点的电势分别为φA=15V,φB=3V,φC=-3V．试求D点的电势,并画出该匀强电场的电场线的分布示意图． 相似文献
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《通化师范学院学报》2006,(2):59-64
听力部分(共四大题．40％) I．听辨单词(Words)(共lO小题，计lO分) 8． A A)听音，选出你所昕到的单词。每个单词只读一遍。 (答案涂在答题纸上) 凸p凸p D p D p凸p凸p凸p D p D p凸p凸p D p 凸 昌1．A．good B．food C．foot D．goose 苫 C 乎．A．1ight B．night C．fruit D．blue 会 q D p3．A．football B．basketball C．baseball D．volleybalp V D &．． ． C． ． 舍 9A home B game C plane D listen ．A 讲．． ． ． ． 凸 ‘A 吕5．A．behind B．stand c．stamp D．side 会 B)听音，看图，选出与你听到的单词属… 相似文献
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《河北自学考试》2001,(8)
一、单项选择题1．1994年年我国税制改革后，增值税的低税率为（ ） A．17％ B．33％ C．13％ D．02．农民合伙或者单独投资设立的乡镇企业，其企业 财产权属于（ ） A．全体农民集体所有 B．乡政府所有 C．村民委员会所有 D．投资者所有3．保险经纪人为投保人与保险人订立保险合同提供 中介服务，是基于投保人的（ ） A．利益 B．请求 C．信任 D．同意4．中国仲裁协会是（ ） A．企业法人 B．社会团体法人 C．机关法人 D．事业单位法人5．在中外合资经营企业的注册资本中，外方合营者 的投资比例一般不得低于（ ） A．15％ B．25％… 相似文献
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电路如图1所示．已知：R1=R2=R3=10Ω，电源电动势E1=5V，A点的电位U=10V，C点的电位Vc=-4V．求B点的电位Vb及流过R3的电流I3. 相似文献
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陈圣胜 《中小学实验与装备》2004,14(5):24-24
为了测定额定电压为2．5V，额定功率约为1w的小灯泡的额定功率。有下列器材供选用：A．电源(2V)；B．电源(6V)；C．电流表(0—0．6A)；D．电流表(0—3A)：E．电压表(0—3V)；F．电压表(0—15V)；G．最大值5Q的滑动变阻器；H． 相似文献
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例1A、B都是芳香族化合物，1molA水解后可得1molB和lmol醋酸．A、B的相对分子质量都不超过200．A、B完全燃烧后都只生成CO2和H2．B分子中碳和氢元素的总质量分数为65．2％．A的溶液具有酸性，不能使氯化铁溶液显色． 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