试论口服避孕药的利与弊

口服避孕药在避孕生效时,防病保健之利亦不小,但在有利发生期间,也有危害健康的弊端,我们在应用时只要分清主次,严格掌握其适应症和禁忌症,则它的利处显然高于其弊端.     

Existence of solutions and positive solutions to a fourth-order two-point BVP with second derivative

~~4[0,1]Csatisfyingand()hr ?*umu'k(mh r)and*uisanonnegativeconcavefunction.Moreover,ifoneofthefollowingconditionsissatisfied:(1)A B>0;(2)C D<0;(3)f(t,0,0)0,0t1,then*u(t)>0,00suchthatmax{():01,0,80}64,rrr?#ft,u,vtuvthentheproblem(P)hasatleastonesolutionu*C4[0,1]satisfying*urand()*"u8randu*isanonnegativeconcavefunction.Moreover,iff(t,0,0)0,0t1,thenu*(t)>0,0相似文献   

涉外护生英语水平的调查与思考

文章通过对我院涉外护理实验班的学生英语水平摸底考试的结果的分析,找出了存在的问题,提出了应对措施。     

关于C程序效率的探讨

C语言是一种应用广泛的计算机语言。从多方面探讨C程序的效率问题，并根据具体情况，提出优化C程序的方法。     

浅谈英语教学误区及其正确发展方向

本文探讨英语语言教学实践中存在的问题如对口语语境和英语文化背景的忽视，违反外语教学基本规律；外语传统教育理念向创新教育理念的发展。     

高校毕业生就业困难分析与解决途径

随着近年来高等教育迅猛发展，特别是高校扩招后毕业生数量急剧增加，使得高校毕业生择业形势已由供方市场变为需方市场，就业难的问题也越来越突出。本文通过对毕业生就业困难进行了一系列的分析，初步探讨了就业困难的成因，并提出了解决这些问题的一些方法。     

H的本征方程的一级近似(n1s)(n2p)组态的求解过程

(n1s)(n2p)组态的求解过程,即通过其Slater波函数及H矩阵,列出其解的结构,求出H矩阵及其久期方程的解,最后求出(n1s)(n2p)组态的原子能量和波函数。     

Listening comprehension and reading comprehension in poor decoders: Evidence for the importance of syntactic and semantic skills as well as phonological skills

The relation between decoding and comprehensionin the oral and written modalities was studiedin a randomly selected group of nine-year-olds,subdivided into good, average and poordecoders. Performances on two types ofcomprehension tasks (story retelling andcloze tasks) were compared and related tophonological, syntactic and semantic abilities.(Story retelling demanded the ability to retellthe gist of a story, while the cloze tasksdemanded precise skills in drawing anaphoricreference across sentence boundaries.) Atwo-way analysis of variance using IQ ascovariate showed that poor decoders scoredlower than average and good decoders on allcomprehension tasks. This suggests a highdegree of interdependence between listeningcomprehension, reading comprehension anddecoding. The associated pattern of oralcorrelates furthermore varied with task demandsand to some extent, independent of modality.Vocabulary was related to the ability toretell a story. Syntax and, in particularphonemic awareness, were on the otherhand more strongly related to the ability todraw anaphoric reference. The results wereinterpreted in favor of ``the phonologicaldeficit hypothesis', but the interactionbetween linguistic sub-skills and task demandswas also underscored.     

吸烟与戒烟心理探析

吸烟是一种危害很大的自我伤害行为，而广大吸烟者由于种种生理的、心理的原因对香烟上瘾，本文着重从几个不同的心理学流派的视角对吸烟行为进行探讨，即认知心理学家强调：由于吸烟者对吸烟的错误认知，支持了（或固定了）个体的吸烟行为；尊神分析理论通常认为：吸烟与口唇期人格发展的停滞和倒退有关；行为主义和社会学习理论则强调：个体已形成的习得无助感加剧了戒烟困难；特质流派的人格理论家认为嗜烟者在人格特质的内-外控制点上比其他个体更倾向于外控。     

浅谈英语"口语"教学中"听说"能力的培养

英语口语是一种利用英语表达思想、进行口头交际的能力.怎样才能快速地提高学生的英语口语能力?要让学生先通过听,大量地接触英语语言之后,便可以开始进行口语能力的训练.