简介：大海、沙滩,是孩子永远也玩不够的地方,也是亲子旅行的最佳目的地。夏季来临,让我们带上孩子再走远一点,去漫游四海吧!不同地域的海，有着不同的美，还蕴含着不同的文化。孩子也许记不住，也说不出，但他能感受。满足孩子需要的同时，也别忘了满足自己的好奇心。所以，这个夏天，不妨换个地方去看海!

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简介：1．单项填空。1.Clearnessof-ismoreimportantthanbeautyoflanguage.A.associationB.dormitoryC.canteenD.statement

简介：1．单词拼写。1.Thebaldeagler-theUnitedStates.

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简介：1．单项填空。1.WhenIwasyoung,Iwastoldthat-playwithmatches.

简介：本文利用群论的知识,从CH4的分子结构出发,研究了群C4v的特征及其特征表的性质,所得结论与用化学方法是相同的.

简介：现在Intel平台的笔记本电脑实际依照所采用处理器类型的不同．分两个方向发展。主流的“迅驰机”固然有综合性能上的卓越优势和适应无线网络潮流的噱头，但Pentium4Mobile处理器乃至Pentium4台式机处理器仍然在经济型笔记本和强调多媒体性能的移动工作站中占据了一席之地。

简介：Weexperimentallydemonstratea4×4nonblockingsiliconthermo-optic(TO)switchfabricconsistingofthreestagesoftunablegeneralizedMach–Zehnderinterferometers.All24routingstatesfornonblockingswitchingarecharacterized.Thedevice’sfootprintis4.6mm×1.0mm.Measurementsshowthattheworstcrosstalkofallswitchingstatesis-7.2dB.Theon-chipinsertionlossisintherangeof3.7–13.1dB.TheaverageTOswitchingpowerconsumptionis104.8mW.

简介：Thesynthesisofopen-fiameworkmetalphosphateshasbeenasubjectofintenseresearchowingtotheirinterestingstructuralchemistryandpotentialapplicationsasionexchangers,catalystsandadsorbents.Alargenumberofthesematerialsaresynthesizedinthepresenceoforganicaminesasstructure-directingagents.Recently,manyresearchactivitieshavefocusedonthesynthesisofinorganic-organichybridframeworks.Ascomparedwithinorganicligands,theadvantageofusingorganicmultidentateligandsistheefficacyofrationaldesignofcrystallinesolidsthroughtheircoordinatingpropensitiesandgeometries.

简介：Thesynthesisandphasebehaviorofaseriesof4’-alkyloxy-4-hydroxybiphenylswerediscribed.Theeffectsofreactionconditionsontheyieldsofproductswereinvestigated.Thecharacterizationsofthermotropicliquidcrystallineproductsforthetypeandthermalpropertiesarediscussedthroughtheuseofdifferentialscanningcalorimetry,polarizingmicroscopy.

简介：Reactionsofthe6-hydroxy-thiopyrano[3,4-c]pyridine-5-carbonitrilederivative1withα-halo-carbonylcompoundsgavetheortho-substitutedintermediates2a-cwhichwereconvertedintofuro[2,3-b]thiopyrano[4,3-d]pyridines3a-cbyfusionofafuranmoietyunderbasicconditions.Furthercyclizationof3a-cledtoafusionofapyrimidinering,yieldingthetetracyclicproducts6,7and8.Inaddition,condensationof6withvariousaromaticaldehydesaffordedthecorrespondingimines9a,b.Mannichreactionof7gaveproducts10a,b.

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简介：Thestructureofpolyimidefrom1,4-bis(3’,4’-dicarboxyphenoxy)benzeneand4,4’-oxydianilinefilmspecimensbeforeandafterhotstretchinghasbeeninvestigatedbyWAXD,DSCandFTIR.AsevidencedbyboththeWAXDandDSCresults,itcouldbebelievedthatstraininducedcrystallizationdidtakeplaceafterhotstretching.Meanwhile,shiftingpositionandsplittingofsomebandpeaksexistedontheFTIRspectrogramswereexplainedintermsoftheclosepackingofchainsandthechangesofinter-molecularcharge-transferinteractionbetweenimidegroupsandaromaticgroupsuponcrystallization.

简介：新西兰新《职业安全健康法》（TheHealthandSafeyatWorkAct）已于4月4日正式生效。此法是新西兰改革蓝图的一部分，旨在到2020年将新西兰严重职业伤亡至少降低25％。该法规定，雇主对员工和可能受到作业影响人员的安全与健康负有主要责任。雇主的主要责任包括：提供无安全健康隐患的工作场所，保持工作场所安全；建立、维持工作安全体系。

简介：【词语精讲】1．representvt．代表。象征；representativen．代表；adj．有代表性的【经典例句】Thetwopoliticiansrepresentoppositepolesofthepoliticalspectrum.这两位从政者代表了政界的两个极端。

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简介：【短语精讲】1．ingeneral总之：一般说来【经典例句】Ingeneral,peopledon＇tliketobemadefunof.一般来说，人们都不喜欢被捉弄。