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基础知识:十进制转十六进制;十六进制转二进制;了解:目前C/C++编译器标准都遵照IEEE制定的浮点数表示法来进行float,double运算。这种结构是一种科学计数法,用符号、指数和尾数来表示,底数定为2——即把一个浮点数表示为尾数乘以2的指数次方再添上符号。下面是具体的规格: 符号位 阶码 尾... 阅读全文
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revolve, evolve, involverevolve v.旋转,转动。The room began to revolve , then he fainted.屋子开始旋转,然后他就昏倒了。evolve v.发展,演变。Agriculture evolved slowly over thou... 阅读全文
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invaluable, valueless invaluable a.无价的,非常宝贵的,相当于priceless。Your help in moving the big refrigerator was invaluable.你帮忙搬那个大冰箱,你的帮助是可贵的。 valueless a.没有价值的,相当于worthless。That bracelet is a cheap, valueless piece of jewelry.那个手镯是一件便宜的、不值钱的首饰。jealous, enviousjealous a.妒忌的,暗含有憎恶与不好的感情。He gets jealous when o 阅读全文
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ignore, neglect, omit, overlook这一组动词都有"忽略"的意思。ignore v.忽视,不理睬,指有意识地拒绝。She saw him coming but she ignored him.她看见他走过来,但是装作没看见。neglect v.忽视,忽略,疏忽,指无意识地忽视或忘记。He neglected to make repairs in his house.他忘记了修理房子。omit v.遗漏,忽略,忘记,指由于疏忽而忘记,也可以表示因不利或不好而被忽略等。She omitted several steps in the experimen 阅读全文
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encourage, excite, inspire, motivate, stimulate 这一组动词都有"鼓励、刺激"的意思。encourage v.鼓励,促进,含有"使增强勇气或给予希望"的意味。 He encouraged his son to go to good college.他鼓励他的儿子上名牌大学。excite v.指使人感到激动、兴奋;煽动,鼓动。The band played louder and excited the audience.乐队演奏得更响亮了,使观众兴奋起来。inspire v.鼓舞,激发,影响,常常带有" 阅读全文
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deviate, distract, divert这三个词都有"转移"的意思。deviate v.背离,偏离。多指脱离正轨或正题等。He deviated from society by becoming a drug addict.他成为一名吸毒者,从而违背了社会道德准则。distract v.使分心,分散(注意力、心理等)。常带有不能专心的意思。Noise distracts him, so he can't study for exams.喧闹声分散了他的注意力,所以他无法进行考试的复习。divert v.转移,使转向,着重改变后的结果,后常接介词from。A 阅读全文
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concentrate, focus 这两个动词都有"集中"的意思。concentrate v.集中,集中精力(后接on,宾语可以是具体或抽象的东西);浓缩,压缩。 During exams, students concentrate hard on answering the questions.考试期间,同学们集中精力回答问题。focus v.集中(于某事物);将(注意力等)集中于……(后接on,宾语一般不是具体的东西)。Please focus your minds on the following problem.请集中考虑以下问题。confinement, lim 阅读全文
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bush, shrub, jungle这一组词均与树木有关。bush n.矮树丛。shrub n.有木茎的灌木,灌木丛。jungle n.热带稠密的雨林或丛林。certify, rectify, testify, verify这是一组形近易混词。certify v.证明,声称是真的。He certi... 阅读全文
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applaud, clap, commend, praiseapplaud v.鼓掌,赞扬,指因精湛表演或某种行为得到别人的赞许,大声叫好或热烈鼓掌。The boss applauded my efforts by praising my work.老板表扬了我的工作,对我的努力表示赞许。clap v.拍打,其用法是clap one's hand=applaud,不能说applaud one's hands。clap sb.为某人鼓掌,clap sth.拍打某物commend v.为正式用词,用于对具体功绩或成就表示嘉奖,通常指上级对下级、长辈对晚辈的赞赏。The teache 阅读全文
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aware, conscious aware a.知道的,意识到的,强调感官对外界事物的意识。He was aware of his mistake.他意识到自己的错误。 conscious a.有意识的,意识到的,一般指内心所意识到的。The salesman is conscious of the fact that he must increase sales.销售员意识到他必须增加销售量。base, foundation, ground这一组名词都有"基础"的意思。base n.指具体的有形的基础,也可指物体的底部、基部;基地,总部。They use their a 阅读全文