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Many theories concerning the causes of juvenile delinquency crimes committed by young people focus e...
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某实验小组利用如下装置部分固定装置略制备氮化钙Ca3N2并探究其实验式反应过程中末端导管必须始终插入试管A的水中目的是______________________
甲乙丙三个化肥厂生产尿素的原料不同但生产流程相同 原料→COH2→CO2NH3→CONH22 试回答下列问题 按照工业有关规定利用基本原料所制得的原料气H2和CO2的物质的量之比若最接近合成尿素的原料气NH3换算为H2的物质的量和CO2的物质的量之比则原料的利用率最高据此判断甲乙丙三个工厂哪个工厂对原料的利用率最高
情绪的三因素理论认为情绪产生包含三个要素_________________以及认知因素
下列实验能达到预期目的的是
下列物质的实验室制法正确的是
已知KNO3在不同温度下的溶解度如下表若把溶质的质量分数为30%的KNO3溶液由50℃逐渐冷却则开始析出晶体的温度范围是 温度℃010203040 溶解度克13.320.931.645.863.9
氢氧化钠固体是实验室常用化学药品在空气中久置会变质下列关于氢氧化钠固体变质的说法正确的是
合理利用二氧化碳可以提高生活质量促进工业发展使用传统催化剂使用二氧化碳与某些有机物反应可以生成塑料但反应时间长目前诞生的纳米级催化剂增加了催化剂的表面积提高了___________使用这种塑料能减少白色污染因为它在微生物作用下可以实现100%的_____________
下列描述中不正确的是
请设计一个教案达到以下目的1.学生能够用英语描述一段旅行2.能够听说读WhereareyougoingonholidayI’mgoingto...用现在进行时表将来3.培养学生运用英语的能力
DRanch.ItwasnearLosAngelesinCalifornia.AfewyearslaterHollywoodwasoneofthefamousplacesintheworld.Atthebeginningofthe20thcenturytherewasabigfarmcalledHollywood.Fromthe1910’stothe1950’sHollywoodwasthefilmcenteroftheworld.Everyfamilyknewthenamesofitsfilmstars—CharlieChaplinGretaGarboBergmanandhundredsmore.ThereasonwhypeoplewenttoHollywoodtomakefilmswasthesun.AtfirstpeoplemadefilmsinNewYorkontheeastcoastoftheUnitedStates.ButthentheyheardaboutLosAngeleswherethereare350daysofthesuneveryyear.Astheymadeallthefilmsbysunlightthewestcoastwasamuchbetterplacetowork.AlsonearHollywoodyoucanfindmountainsandseaanddesert.Theydidnothavetotravelfartomakeanykindoffilm.WhenTVbecamepopularHollywoodstartedmakingfilmsfortelevision.Theninthe1970’stheydiscoveredpeoplestillwenttothecinematoseebigexpensivefilms.NowadaystheyarestillmakingfilmsinHollywoodandpeopleseethemallovertheworld. Whichstatement说法istrue
1924年_______________编写了我国第一本教育心理学教科书
如果高水平学生在测验项目上能得高分而低水平学生只能得低分那么就说明下列哪种质量指标高
可逆反应2A+Bs3C达到平衡后加压升温平衡均向正反应方此资料转贴于贵州学习HtTp//WwW.GzU521.CoM向移动则下列结论正确的是
EAdvertiserstendtothinkbigandperhapsthisiswhythey’realwayscominginforcriticism.Theircriticsseemtoresentthembecausetheyhaveaflairforselfpromotionandbecausetheyhavesomuchmoneytothrowaround.“It’siniquitous”theysay“thatthisentirelyunproductiveindustryifwecancallitthatshouldabsorbmillionsofpoundseachyear.Itonlygoestoshowhowmuchprofitthebigcompaniesaremaking.Whydon’ttheystopadvertisingandreducethepriceoftheirgoodsAfterallit’stheconsumerwhopays...”Thepooroldconsumer!He’dhavetopayagreatdealmoreifadvertisingdidn’tcreatemassmarketsforproducts.Itispreciselybecauseoftheheavyadvertisingthatconsumergoodsaresocheap.Butwegetthewrongideaifwethinktheonlypurposeofadvertisingistosellgoods.Anotherequallyimportantfunctionistoinform.Agreatdealoftheknowledgewehaveabouthouseholdgoodsderiveslargelyfromtheadvertisementsweread.Advertisementsintroduceustonewproductsorremindusoftheexistenceoftheoneswealreadyknowabout.Supposingyouwantedtobuyawashingmachineitismorethanlikelyyouwouldobtaindetailsregardingperformancepriceetc.fromanadvertisement.Lotsofpeoplepretendthattheyneverreadadvertisementsbutthisclaimmaybeseriouslydoubted.Itishardlypossiblenottoreadadvertisementsthesedays.Andwhatfuntheyoftenaretoo!Justthinkwhatarailwaystationoranewspaperwouldbelikewithoutadvertisements.WouldyouenjoygazingatablankwallorreadingrailwaybylawswhilewaitingforatrainWouldyouliketoreadonlycloselyprintedcolumnsofnewsinyourdailypaperAcheerfulwittyadvertisementmakessuchadifferencetoadrabwalloranewspaperfullofthedailyrationofcalamities.Wemustnotforgeteitherthatadvertisingmakesapositivecontributiontoourpockets.Newspaperscommercialradioandtelevisioncompaniescouldnotsubsistwithoutthissourceofrevenue.Thefactthatwepaysolittleforourdailypaperorcanenjoysomanybroadcastprogramsisdueentirelytothemoneyspentbyadvertisers.Justthinkwhatanewspaperwouldcostifwehadtopayitsfullprice!Anotherthingwemustn’tforgetisthe“smallads”whichareinvirtuallyeverynewspaperandmagazine.Whatatremendouslyusefulservicetheyperformforthecommunity!Justaboutanythingcanbeaccomplishedthroughthesecolumns.Forinstanceyoucanfindajobbuyorsellahouseannounceabirthmarriageordeathinwhatusedtobecalledthe“hatchmatchanddispatch”columnbutbyfarthemostfascinatingsectionisthepersonalor“agony”column.Nootheriteminanewspaperprovidessuchentertainingreadingorofferssuchadeepinsightintohumannature.It’sthebestadvertisementforadvertisingthereis! Theattitudeoftheauthortowardadvertisersis.
个体身心发展的某一方面机能和能力最适宜于形成的时期称为
合理利用二氧化碳可以提高生活质量促进工业发展在常压下-78℃时二氧化碳气体凝结成固态二氧化碳俗称干冰某学生买回一盒冰淇淋月饼盒里有很多作为制冷剂的碎干冰下列关于干冰处理的正确做法是
在一定条件下对于密闭容器中进行的反应CO+NO2CO2+NO下列说法中可以充分说明这一反应达到化学平衡状态的是
...twomenbattereachothertopulpintheboxingring.
下列气体收集方法完全相同的是
DRanch.ItwasnearLosAngelesinCalifornia.AfewyearslaterHollywoodwasoneofthefamousplacesintheworld.Atthebeginningofthe20thcenturytherewasabigfarmcalledHollywood.Fromthe1910’stothe1950’sHollywoodwasthefilmcenteroftheworld.Everyfamilyknewthenamesofitsfilmstars—CharlieChaplinGretaGarboBergmanandhundredsmore.ThereasonwhypeoplewenttoHollywoodtomakefilmswasthesun.AtfirstpeoplemadefilmsinNewYorkontheeastcoastoftheUnitedStates.ButthentheyheardaboutLosAngeleswherethereare350daysofthesuneveryyear.Astheymadeallthefilmsbysunlightthewestcoastwasamuchbetterplacetowork.AlsonearHollywoodyoucanfindmountainsandseaanddesert.Theydidnothavetotravelfartomakeanykindoffilm.WhenTVbecamepopularHollywoodstartedmakingfilmsfortelevision.Theninthe1970’stheydiscoveredpeoplestillwenttothecinematoseebigexpensivefilms.NowadaystheyarestillmakingfilmsinHollywoodandpeopleseethemallovertheworld. Whowasnotmentioned提到asafilmstarinthepassage.
毒品__为芳香族化合物分子中只含有碳氢氮三种元素相对分子质量不超过150碳元素和氢元素的质量分数之和为90.6%请按要求填空__的同分异构体有很多种请写出同时符合下列三项要求的__的同分异构体的结构简式________________________________________只要求写出其中的三种 ①苯环上只含有两个相邻的取代基②分子中含有氨基-NH2③分子中含有两个甲基-CH3
C和Si元素在化学中占有极其重要的地位写出Si的基态原子核外电子排布式从电负性角度分析CSi和O元素的非金属活泼由强至弱的顺序为______________________
C和Si元素在化学中占有极其重要的地位氧化物MO的电子总数与SiC的相等则M为填元素符号MO是优良的耐高温材料其晶体结构与NaCl晶体相似MO的熔点比CaO的高其原因是_______________________
同一周期的主族元素从左到右原子半径逐渐金属性逐渐
Advertiserstendtothinkbigandperhapsthisiswhythey’realwayscominginforcriticism.
It’sthebestadvertisementforadvertisingthereis.
.将一块严重腐蚀而部分变成铜绿［化学式为Cu2OH2CO3］的铜块磨成粉末在空气中充分灼烧成CuO发现固体质量在灼烧前后保持不变则灼烧前粉末中铜单质的质量分数为
EAdvertiserstendtothinkbigandperhapsthisiswhythey’realwayscominginforcriticism.Theircriticsseemtoresentthembecausetheyhaveaflairforselfpromotionandbecausetheyhavesomuchmoneytothrowaround.“It’siniquitous”theysay“thatthisentirelyunproductiveindustryifwecancallitthatshouldabsorbmillionsofpoundseachyear.Itonlygoestoshowhowmuchprofitthebigcompaniesaremaking.Whydon’ttheystopadvertisingandreducethepriceoftheirgoodsAfterallit’stheconsumerwhopays...”Thepooroldconsumer!He’dhavetopayagreatdealmoreifadvertisingdidn’tcreatemassmarketsforproducts.Itispreciselybecauseoftheheavyadvertisingthatconsumergoodsaresocheap.Butwegetthewrongideaifwethinktheonlypurposeofadvertisingistosellgoods.Anotherequallyimportantfunctionistoinform.Agreatdealoftheknowledgewehaveabouthouseholdgoodsderiveslargelyfromtheadvertisementsweread.Advertisementsintroduceustonewproductsorremindusoftheexistenceoftheoneswealreadyknowabout.Supposingyouwantedtobuyawashingmachineitismorethanlikelyyouwouldobtaindetailsregardingperformancepriceetc.fromanadvertisement.Lotsofpeoplepretendthattheyneverreadadvertisementsbutthisclaimmaybeseriouslydoubted.Itishardlypossiblenottoreadadvertisementsthesedays.Andwhatfuntheyoftenaretoo!Justthinkwhatarailwaystationoranewspaperwouldbelikewithoutadvertisements.WouldyouenjoygazingatablankwallorreadingrailwaybylawswhilewaitingforatrainWouldyouliketoreadonlycloselyprintedcolumnsofnewsinyourdailypaperAcheerfulwittyadvertisementmakessuchadifferencetoadrabwalloranewspaperfullofthedailyrationofcalamities.Wemustnotforgeteitherthatadvertisingmakesapositivecontributiontoourpockets.Newspaperscommercialradioandtelevisioncompaniescouldnotsubsistwithoutthissourceofrevenue.Thefactthatwepaysolittleforourdailypaperorcanenjoysomanybroadcastprogramsisdueentirelytothemoneyspentbyadvertisers.Justthinkwhatanewspaperwouldcostifwehadtopayitsfullprice!Anotherthingwemustn’tforgetisthe“smallads”whichareinvirtuallyeverynewspaperandmagazine.Whatatremendouslyusefulservicetheyperformforthecommunity!Justaboutanythingcanbeaccomplishedthroughthesecolumns.Forinstanceyoucanfindajobbuyorsellahouseannounceabirthmarriageordeathinwhatusedtobecalledthe“hatchmatchanddispatch”columnbutbyfarthemostfascinatingsectionisthepersonalor“agony”column.Nootheriteminanewspaperprovidessuchentertainingreadingorofferssuchadeepinsightintohumannature.It’sthebestadvertisementforadvertisingthereis! WhichofthefollowingisNotTrue
某实验小组利用如下装置部分固定装置略制备氮化钙Ca3N2并探究其实验式数据记录如下空瓷舟质量m0/g瓷舟与钙的质量m1/g瓷舟与产物的质量m2/g14.8015.0815.15①计算得到实验式CaxN2其中x=_____________ 若通入的N2中混有少量O2请比较x与3的大小并给出判断依据___________________________
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