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International Museum Day is coming. Here are some special museums that you must see. （1）If you're...
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为研究稀土复合叶面肥对苹果叶片光合作用的影响在夏季晴朗的白天将生长状态基本相同的富士苹果植株分为四组分别施用等量的稀土浓度为00.010.11mg/L的叶面肥．实验测得的叶绿素含量以及10点和12点净光合速率的结果如图所示回答下列问题． l设置稀土浓度为0mg/L实验的目的是为了排除的干扰． 2从图中结果可知施加稀土叶面肥能提高净光合速率可能是通过影响光合作用实现的原因是． 3由图可知对照组中植物12点的净光合速率明显比10点低造成的主要原因可能是．对照组的净光合速率下降幅度填“大于”“等于”或“小于”实验组．
25分最近某英语交流学习论坛提出一个话题Shouldsquaredancingbeforbidden?并邀请网友参与讨论.你打算参加请根据以下内容写一篇发言稿. 内容包括 1.广场舞的现状 2.表明你的观点 3.给出理由. 注意1.词数100左右 2.可适当增加细节以使行文连贯.
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超分子化学已逐渐扩展到化学的各个分支还扩展到生命科学和物理学等领域．由Mo将2个C60分子2个p﹣甲酸丁酯吡啶及2个CO分子利用配位键自组装的超分子结构如图1所示． 1Mo处于第五周期第VIB族核外电子排布与Cr相似它的基态价电子排布式是核外未成对电子数是个． 2该超分子中存在的化学键类型有． A．σ键B．π键C．离子键D．氢键 3该超分子中配体CO提供孤电子对的原子是填元素符号p﹣甲酸丁酯吡啶配体中C原子的杂化方式有． 4从电负性角度解释CF3COOH的酸性强于CH3COOH的原因． 5C60与金刚石互为同素异形体从结构与性质之间的关系解释C60的熔点远低于金刚石的原因是． 6已知某晶胞中各原子的相对位置可用如图2所示的原子坐标表示其中所有顶点原子坐标均为000． 钼Mo的一种立方晶系的晶体结构中每个晶胞有2个Mo原子其中Mo原子坐标是000及．根据以上信息推断该晶体的原子堆积方式是．已知该晶体的密度是ρg•cm﹣3Mo的摩尔质量是Mg•mol﹣1阿伏加德罗常数是NA晶体中距离最近的Mo原子核之间的距离为pm．
洗衣液具有使用简单溶解迅速去污力高易漂白等优点越来越受到消费者的欢迎．为增强产品功效洗衣液配方中通常含有酶制剂香精等．回答下列问题 1酶活性的高低可以用在一定条件下来表示．某品牌洗衣液能高效清除衣物上的血渍和奶渍说明其添加的酶制剂中含有酶． 2在探究不同品牌洗衣液洗涤效果的实验中需要控制的无关变量有．答出两点即可 3菌株R分泌的酶A酶B都可用于洗衣液中酶制剂的生产．利用凝胶色谱法可比较酶A酶B的分子大小用填“相同”或“不同”的溶液先后浸泡凝胶洗脱样品后相对分子质量填“大”或“小”的酶分子先被洗脱出来． 4某洗衣液添加了桉树油桉树油一般从新鲜的桉树叶中提取过程如下 图中A表示的提取方法是为利于油水混合物出现分层便于用分液漏斗分离得到桉树油向混合物中加入．
为探究Cu2+能否使唾液淀粉酶失活某同学进行了有关实验步骤如表已知S对实验结果没有影响． 回答下列问题 1请将步骤3补充完整． 2有同学认为该实验检测试剂不当理由是．可以换用试剂检测若Cu2+能使唾液淀粉酶完全失活检测结果是．
2018年全国生态环境保护大会明确了建设“美丽中国”的时间表和路线图要求到2035年生态环境质量实现根本好转美丽中国目标基本实现．请回答下列问题． l一个相对稳定的生态系统时刻进行着物质循环和能量流动．从物质循环角度看动物捕食植物过程中植物中的碳以形式传递给动物．从能量流动角度看研究能量流动的意义可以帮助人们合理调整能量流动关系使能量持续高效地流向． 2生态系统各植物的种群数量能在较长时期内保持动态平衡说明生态系统具有一定的自我调节能力其基础是． 3与人工林相比自然森林的抵抗力稳定性较强其原因是．
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试管中盛有10℃时KMnO4的不饱和溶液参考如图下列说法正确的是
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细胞是生物体结构和功能的基本单位．下列相关叙述正确的是
15分Somesaythatmadnessandgenius天才oftencomehandinhand.ThisisespeciallytrueoftheDutchpainterVincentVanGogh. VanGoghisfamousforhisamazinguseofcolorandshape.1bearin1853hewaspaintingatatimewhenartwas2change.Alongtimeagoartiststried3maketheirpaintingslookreallylikephotographs.Butlateronartbecamemoreabouttheartist'sownideas.IfyouseeaVanGoghitwon'tlookliketherealworld.Itwilllookeven4beautiful. SomeofVanGogh'smostfamouspaintingsareofnaturalscenesandflowerssuchasSunflowers.Healsopaintedmanywonderfulself﹣portraits自画像5self﹣portraitsbroughthimalotoffame.VanGoghhadagreatgiftforpaintinghoweverhewasatroubledman.Atonepointhecutoffhisownear. VanGoghisnowoneoftheworld'smostfamousartists.Buthediedattheageof37aloneandpoor.Almost6kneworcaredabouthisartatthattime.Althoughhewasagreatgeniushesuffered7great.Somesaythathismadnesswaswhathepaidforhisart. ActuallyifVanGogh8dieattheageoftwentynoonewouldhaveconnectedhimwithfailureormental9ill.Insteadhewouldhavebeenrememberedbythoseclosetohim10adutifulson.
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设NA为阿伏加德罗常数的值．下列说法正确的是
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8分TheUnitedStatesChinaandBrazilallmadenewcommitmentstofightagainstclimatechangeTuesdayinadvanceofalandmarkUnitedNationsconferenceontheissueinDecember.TheUSandBrazilpromisedtoincreaseproductionofelectricityfromrenewableresourcestorepresent20%ofelectricityby2030.That'sthreetimesasmuchenergyastheUScurrentlyproducesandtwiceinBrazilaccordingtotheWhiteHouse.Brazilalsoannouncednewmeasurestocontroldeforestation滥伐森林. BrianDeeseseniorclimatechangeadviserattheWhiteHousetoldreportersonaconferencecallthatthejointannouncementsubstantially大大地promotesclimateprogressandshouldprovidemomentum动力movingintooursharedobjectiveofreachinganagreementinPairslaterthisyear. InaseparateannouncementtheChinesegovernmentsaiditwouldaimtohavecarbonemissionspeakin2030.Bythatdatethecountryhopestoseeasignificantreductionincarbonintensity﹣ameasureoftheamountofcarbonemissionsperunitofgrossdomesticproductcomparedto2005levels.China'scarbondioxideemissionswillpeakbyaround2030andChinawillworkhardtoachievethetargetatanevenearlierdateChinesePremierLiKeqiangsaidonTuesdayinFranceaccordingtotheGuardian. TheannouncementfromtheUSandBrazilcameduringameetingbetweenBrazilianPresidentDilmaRouseffandUSPresidentBarackObama.TheChineseannouncementcamefollowingmeeting. Tuesday'scommitmentsareintendedtopositionChinaandBrazilasleadersinfightingagainstclimatechangeaheadofDecemeber'sClimateChangeConferenceinPairs.Manyenvironmentalactivitieshopethatthegatheringwillleadtoarestraining限制的agreementtosignificantlyreducecarbonemissionstofightagainstclimatechange.TheUSsaidearlierthisyearthatitplanstoreduceemissionsby26%to28%below2005levelsby2020. 1WhatdoestheunderlinedphrasethetargetinParagraph3referto? A.Theincreaseofelectricityproduction. B.Effectivemeasuresagainstdeforestation. C.Tohavecarbonemissionspeakin2030. D.Thearrivalofabindingagreement. 2WhichofthefollowingstatementsisNOTtrueaccordingtothepassage? A.Chinaisgoingtoworkhardtohavecarbonemissionspeakasearlyaspossible. B.TheUSandBrazilarelikelytoproducemoreelectricityfromrenewableresourcesinthecomingfuture. C.Lotsofenvironmentalactivitiesareinfavorofabindingagreementtoreducecarbonemissions. D.TheUSnowproducesmoreelectricityfromrenewableresourcesthanemissions. 3Whatisthemainideaofthepassage? A.TheUSChinaandBrazilcommitthemselvestonewclimatechangegoals. B.TheUSremainspowerfulineveryaspectoflife. C.Chinaalonecanreducecarbonmissionsby2030. D.Peoplearegladtoseeabindingagreementreached. 4Whoaretheintendedreadersofthepassage? A.Governmentofficials. B.Thegeneralpublic. C.Scientificresearchers. D.Environmentalactivists.
我们每时每刻都离不开空气．空气中含量最多的气体是
已知pOH＝﹣lgcOH﹣．室温下将稀盐酸滴加到某一元碱BOH溶液中测得混合溶液的pOH与离子浓度的变化关系如图所示．下列叙述错误的是
实验室用将氯酸钾与二氧化锰加热制取氧气．下列说法中正确的是
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