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如图为KNO3、NaNO2（亚硝酸钠）、NaCl的溶解度曲线，下列说法正确的是（ ）
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亚硝酸钠的水溶液呈碱性亚硝酸钠能将Fe2+转化为Fe3+因此一些不法奸商为使腌肉制品的色泽更吸引顾客
观察颜色
品尝味道
用水溶解
分别溶于水测其pH
2008年揭阳市右图是KNO3和NaCl的溶解度曲线下列说法中正确的是
NaCl 的溶解度不受温度的影响
t10
时 ，100g KNO3 饱和溶液中含有20g KNO3
C.t20C.时 ，KNO3的饱和溶液和NaCl 的饱和溶液中溶质的质量分数不一定相等
温度高于t20C.时， KNO3的溶解度大于NaCl 的溶解度
长时间腌制的蔬菜中含有致癌物亚硝酸钠NaNO2它是硝酸钠NaNO3在一定的条件下反应生成的现有一包含
工业用盐亚硝酸钠NaNO2外观极像食盐人若误食亚硝酸钠会中毒亚硝酸钠中氮元素的化合价是
+1
+2
+3
+4
某建筑工地发生多人食物中毒经化验为误食工业用盐亚硝酸钠NaNO2所致NaNO2中氮元素的化合价是
+2
+3
+4
+5
工业用盐亚硝酸钠NaNO2有毒亚硝酸钠中氮元素的化合价是
+1
+2
+3
+5
右图为KNO3和NaCl两种物质的溶解度曲线1两种物质的溶解度受温度的影响变化较大的是_______
亚硝酸钠NaNO2常用作食品的发色剂和防腐剂但食品中的亚硝酸钠含量超标会危害人体健康．亚硝酸钠具有
如图为KNO3NaNO2亚硝酸钠NaCl的溶解度曲线请分析图象回答下列问题1KNO3NaNO2NaC
亚硝酸钠NaNO2常用作食品的发色剂和防腐剂但食品中的亚硝酸钠含量超标会危害人体健康.亚硝酸钠具有咸
工业用盐亚硝酸钠NaNO2外观极像食盐人若误食亚硝酸钠会中毒亚硝酸钠中氮元素的化合价是
+1
+2
+3
+4
2008年黄石市右图是KNO3和NaCl的溶解度曲线下列说法中正确的是
NaCl的溶解度不受温度的影响
KNO3的溶解度大于NaCl的溶解度
t1℃时，100g KNO3的饱和溶液中含有20克 KNO3
t2℃时，NaCl的饱和溶液与KNO3的饱和溶液中溶质的质量分数相等
右图表示是KNO3和NaNO3的溶解度曲线下列说法正确的是
t1℃时，两种溶液中溶质质量分数一定不相等
t1℃时，在50g水里加入15g KNO3固体，充分溶解，得到60g溶液
t1℃时，硝酸钾、硝酸钠两物质饱和溶液升温到t2℃后，溶质质量分数相等
两种饱和溶液从t2℃降温到t1℃时，析出晶体：硝酸钾一定多于硝酸钠
工业用盐亚硝酸钠是有毒物质外观和口味与食盐相似我国曾多次发生民工用亚硝酸钠代替食盐进行烹饪而中毒的事
＋1
＋2
＋3
＋5
如图为KNO3NaNO2亚硝酸钠NaCl的溶解度曲线请分析图像回答下列问题160℃时KNO3饱和溶液
亚硝酸钠NaNO2外观类似食盐可能因误作食盐而发生食物中毒事故欲鉴定之可将亚硝酸钠及食盐用水溶解后分
NaNO
3
AgNO
3
KNO
3
Cu（NO
3
）
2
如图为KNO3NaNO2亚硝酸钠NaCl的溶解度曲线请分析图象回答下列问题1NaNO2因外观与NaC
2011年4月7日甘肃省平凉市崆峒区又发生一起误把亚硝酸钠当食盐的中毒事件确保食品安全的警钟再次敲响
SO2
NH3
N2
NO2
亚硝酸钠NaNO2外观与食盐极相似有咸味区别它们的有效方法是隔绝空气加热没有明显变化的是食盐能分解放
S02
N02
N2
NH3
如图为KNO3NaNO2亚硝酸钠NaCl的溶解度曲线请分析图象回答下列问题160℃时KNO3饱和溶液
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在“探究电流与电阻的关系”实验中 1请用笔画线代替导线按图1将图2中完成电路的连接 2利用图1所示电路实验得到图3所示的电流随电阻变化的图象．图中阴影部分表示的物理量是计算其数值是 3在每次换上不同的阻值的电阻R0都要调节滑动变阻器是使R0两端电压选填“增大”“不变”或“减小”．图1的电源电压9V某次接入一个阻值标注值模糊的电阻R0时正确操作后读出电流表示数此时滑动变阻器连入电路的阻值估计为2Ω则这次实验所接入的电阻R0为Ω．
8分Thealarmsounds.Studentsswingtheirbackpackovertheirshoulderboardtheschoolbusmaketheirwaytotheirhomeroomandthebellrings﹣schoolisback.ButformorehomesinAmericaschoollooksmorelikestudentswakingupmakingtheirwaytothediningroomorhomeofficesettinguplaptopsandlearninginthecomfortofhome. Virtual虚拟的schoolingdescribedasapublicschoolthatoffersonlyinstructioninwhichstudentsandteachersareseparatedbytimeand/orplaceandinteractionoccursviacomputersand/ortelecommunications电信technologieshasincreasedoverthepastdecade.AccordingtotheNationalEducationPolicyCenterenrollments注册人数invirtualschoolswas278518betweenthe2015﹣2016schoolyearandthe2016﹣2017schoolyearincreasedby17000. ForArizonaVirtualAcademyafull﹣timeonlinepublicK﹣12schooltheyuseK12Inc.curriculums.K12Inc.servesstudentsinall50statesandmorethan100countrieswithdigitallearningplatformsandtechnologyprovidingonlineeducation.Wealwaysareimprovingourplatformsandthetechnologythatweusetomakesurethatwe'rekeepingupwiththechangingtrendsnotonlywitheducationbutalsowithtechnologyDr.KellyVanSandesaid.Anotherpieceofnewtechnologythey'verolledoutisanewappwhereparentscanfindvirtualschoolsavailableintheirarea. CarrieFaulknerchosetoenrolltwoofherchildreninArizonaVirtualAcademy.Shesaysthey'vedoneschoolingonlineinChicagoinCaliforniaatrestaurantsandonhercousin'sfloorinKansas.Itdoesn'tmatterwhetherhehersonisonthecouchinhisbedoratthekitchentablehecandoschoolingwhereverhewantstoFaulknersaid.IwishtheyhaditformebackwhenIwasinschool.Thatwouldhavebeenawesome. 1Whydoestheauthorcomparethetwokindsofschoolinginthefirstparagraph? A.Toattackrealschooling. B.Togiveanexampleofvirtualschooling. C.Tointroducethetopicvirtualschooling. D.Todescribevividlystudents'goingtoschool. 2Howmanystudentsattendedvirtualschoolsduringthe2016﹣2017schoolyear? A.295518 B.17000. C.278518. D.147759. 3WhatcanweinferaboutArizonaVirtualAcademy? A.Theyprovidebothonlineandofflineeducation. B.They'reintendedforstudentsintheUnitedStates. C.Theirnewappletspeoplefindschoolsworldwide. D.Theirplatformsandtechnologyareveryadvanced. 4WhatisCarrieFaulkner'sattitudetovirtualschooling? A.Ambiguous. B.Cautious C.Supportive. D.Disapproving.
15分Thesilentkiller﹣airpollutioncausessevenmillionpremature过早的1deathayearnotjustin2developcountriesbutalsoinUKandtheUSAaswell.InChinapeoplearewellawareofthehealthproblemsitbrings. Icheckeveryparteveryday.IfithasheavyairpollutionIwillpreparemasksformyfamily.Idislike3whentheairisbad.BecausebadairmakesitdifficultformetobreatheandIthinkitdoesinfluencemy4performatwork.Anewresearchinchinahasalsofoundalinkbetweenairqualityandlevelsofintelligence.Inthestudy25000peoplelivingacrossChina5testinlanguageandmathskillslastyear.Theyfoundtheresultsofthose6livedinmorepollutedareaswere7negativeimpactedespeciallyinlanguages.Itaddstoagrowingbodyofevidencethatairpollutionhasaneffectnotjustonthelungsandheart8onthebrain. Thisresearchshowsthatthelongerweareexposedtoairpollutionthe9manyproblemswe'restoringupforlaterlife.CampaignershopethisstudywillpersuadetheBritishgovernment10thinkhardbeforeitpublishesitscleanairstrategynextyear.
如图为汽油机工作过程中某一冲程的示意图此冲程的名称及能量转化是
在下列现象中可能引起保险丝熔断的是 ①插座中的两根线头相碰②开关中的两根线头相碰 ③电路中增加了大功率用电器④户外输电线绝缘皮损坏．
25分假定你是李华你的英国朋友David写邮件告知你他打算购买红楼梦ADreaminRedMansions英文版但不知道纸质版本和有声版本哪个更适合.请你给他提出建议要点如下 1.你的建议 2.你的理由至少两条 注意 1.词数100左右 2.可以适当增加细节以使行文连贯. 参考词汇有声读物audiobook
如图所示小刚透过装水的圆柱形杯子观察铅笔．手中铅笔的笔尖原来朝左的可他看到的像却是笔尖朝右则他看到的是铅笔的选填“实”或“虚”像这是因为杯子和水起到了凸透镜的作用选填“近”或“远”视眼镜用的就是这种透镜．若将铅笔继续选填“靠近”或“远离”杯子他所看到的像将会变成笔尖朝左．
登山是人们喜爱的一种健身方式登山时为避免后仰上身应稍向前倾同时背囊中较重的物品最好放在如图所示中的选填“A”或“B”位置处．图中背着背囊的人提起左脚时可看作以右脚跟o点为支点的一个杠杆请作出B点重物受到的重力和力臂．
如图所示的四个实例中其设计是考虑到要减小压强的是
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