向量法并非就是向量坐标法

在立体几何里,一提到向量法,几乎所有的师生想到的可能都是向量坐标法.事实上,向量法大致可分为两类:坐标法和非坐标法(或者称基底法).向量基底法更加"厉害",坐标法可解决的问题都可用基底法解答,对于空间几何体本身不具备垂直关系,或建立直角坐标系较为麻烦的,或不易求解点的坐标的题目,用基底法则更简明快捷.     

向量法并非就是向量坐标法

在立体几何里,一提到向量法,几乎所有的师生想到的可能都是向量坐标法.事实上,向量法大致可分为两类：坐标法和非坐标法（或者称基底法）.向量基底法更加＂厉害＂,坐标法可解决的问题都可用基底法解答,对于空间几何体本身不具备垂直关系,或建立直角坐标系较为麻烦的,或不易求解点的坐标的题目,用基底法则更简明快捷.     

算术法与方程法并重

我觉得在解决分数问题的教学中应强调算术法与方程法并重,使其相辅相成。当学生对用算术法求一个数的几分之几是多少的问题已经掌握时．再转到学习“已知一个数的几分之几是多少,求这个数”的问题,先逐步出现方程法。并在学生熟悉方程法后,再去沟通方程法与算术法的联系,然后让学生选择喜欢的解法。这样处理对学生的思维发展和今后中学数学的学习也会有帮助。现以最常见的分数问题为例激谈本人在教学中的一些做法。     

试论法的渊源与法的形式

法的渊源是法的形式的源泉,法的形式则是从法的渊源中产生出来的,是法的渊源的制度化的表述,两者的确有密切的关联。但是法的渊源和法的形式又是两种现象和范畴,在法律科学中法的渊源和法的形式的界限是最易被混淆的。实现法的渊源和法的形式的界分是不断深入的法学研究的需求。     

交际法与结构法的比较

本文介绍了一种新的外语教学流派—交际法。简要地介绍了交际法的起源;为了对交际法有一较深刻的认识,对其与传统结构法作了详尽的比较;最后,探讨了交际法的优点及可能存在的问题。     

虚实法和符号法

通过典型例题，应用虚实法和符号法解决球面共轴系统成象问题，以比较两种方法的特点、联系和适用范围，进一步掌握成象的规律．     

相量法与旋转矢量法

本文从正弦量Xmcos(ωt φ)与复值函数Xmej(ωt φ)之间的对应关系出发 ,论述了相量法与旋转矢量法的异同。给出了旋转矢量法的一种较为贴切的称谓     

西方法哲学视野中的法的品性

法的品性展示着法的使命、尊严和生命,它是不断敞开着的生长过程,也是思想对其不断解蔽的思辨过程。西方法哲学经典理论从各自视角对法的品性的解读呈现出多样化图像,我们可以从中统合出法的品性之"三一"式体系:法的公理品性、共识品性和公器品性。法的公理品性,是人的尊严与生存法则,体现着法的总精神,它是良知与良法之根;法的共识品性,是对法的公理品性的道德信念,体现为公共正义感和民族精神;法的公器品性,是指法对其公理品性的具体确认与强制实现。前两种品性保证了法之良法品质,后一种品性保障了法之效力性能,这三种品性共同构成法的精髓:法是通过道德共识而对自由公理的普遍确认与有效保障之神器。     

先通法 后巧法

异分母的分式加减法是分式运算的重点，必须认真学好．其学法是先通法，后巧法．一、掌握运算步骤，学好通法异分母的分式加减法的一般步骤是：（1）把各式的分母分解困式；（2）确定各分母的最简公分母；（3）利用分式的基本性质化异分母为同分母；（4）进行计算，最后结果化为最简分式．二、抓住特点，运用巧法有些异分母的分式加减法题目，若按通法，则计算过程繁杂；若抓住其特点，运用技巧，可化繁为简．常用技巧有：1．逐次通分．分步计算2．分离常数，分组通分”3．逆用通分法则，化积为差先通法　后巧法@赵建勋$河北正定中学!050800…     

排比法——一种不容忽视的论证法

谈到论证法，我们随口就可说出例证法、对比法、喻证法、归谬法、引证法等，其实，排比法也是一种不容忽视的论证法。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

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?     

Western and Eastern culture differences in commercial field

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.     

只要努力,不要后悔

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.     

浅谈移民问题

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.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

风的曲线

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.