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如图，圆锥的母线长为10cm，高为8cm，则该圆锥的侧面展开图（扇形）的弧长为 cm．（结果用π表示）
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如图圆锥的母线长为10cm高为8cm则该圆锥的侧面展开图扇形的弧长为cm．结果用π表示
如图圆锥的母线长为10cm高为8cm则该圆锥的侧面展开图扇形的弧长为cm．结果用π表示
圆锥的母线长8cm底面圆的周长为12cm则该圆锥的侧面积为．
如图圆锥的母线长为10cm高为8cm则该圆锥的侧面展开图扇形的弧长为cm.结果用π表示
已知圆锥的底面半径为6cm高为8cm则这个圆锥的母线长为
12cm
10cm
8cm
6cm
如图圆锥的母线长为10cm高为8cm则该圆锥的侧面展开图扇形的弧长为cm．结果用π表示
已知一个圆锥的母线长为10cm将侧面展开后所得扇形的圆心角是144°则这个圆锥的底面圆的半径是cm.
已知圆锥的侧面积等于cm2母线长10cm则圆锥的高是cm.
一个底面直径为10cm母线长为15cm的圆锥它的侧面展开图圆心角是度.
已知一个圆锥的底面半径为3cm母线长为10cm则这个圆锥的侧面积为
30πcm
2
50πcm
2
60πcm
2
3
πcm
2
圆锥的底面半径为6cm母线长为10cm则圆锥的侧面积为cm2.
已知圆锥的侧面积等于60πcm2母线长10cm则圆锥的底面半径是
已知圆锥的母线长为10cm高为8cm则该圆锥的侧面积为cm2．结果用π表示
已知圆锥的底面半径为6cm高为8cm则这个圆锥的母线长为
12cm
10cm
8cm
6cm
圆锥的母线长为13cm高线长为5cm圆锥的侧面积为
圆锥的母线长8cm底面圆的周长为12cm则该圆锥的侧面积为
40cm
2
44cm
2
48cm
2
52cm
2
若圆锥的高是8cm母线长是10cm则这个圆锥的侧面积是cm2结果保留π．
已知一个圆锥的底面半径为3cm母线长为10cm则这个圆锥的侧面积为_______cm2.
有一个底面半径为3cm母线长10cm的圆锥则其侧面积是__________cm2
已知圆锥的底面半径为5cm母线长为8cm则它的侧面积为cm2.
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ABCDE分别表示教案备课库常见的五种物质它们的部分反应和转化关系如图所示．“”表示两种物质能发生反应“”表示一种物质能转化成另一种物质省略部分反应物或生成物及反应条件不考虑微溶物．C是盐D是氧化物． 1若A为二氧化碳A与B的相互转化能实现自然界中的碳氧循环C可用于制玻璃E是单质． ①写出CD物质的化学式C．D． ②A与E反应的化学方程式为 2若A为铁且E与A的转化关系不存在C溶液为浅绿色且溶质由两种元素组成D是黑色固体B与D发生置换反应生成A． ①A转化为C的实验现象为． ②E是无色溶液分别与AC都能发生反应产生明显现象则E为溶液．
Forhealthyadultsexpertssaythateatingalotoffruitisunlikelytogetyouintotroubleaslongasit'spartof1normaldiet. Themainconcernwithovereatingfruitis2itnaturalsugaryetresearchhasalwayslinkedwhole﹣fruiteatingtoa3reduceriskforobesityandotherdiseases.That'sbecausewholefruithasafewbuilt﹣in4advaniagethatseemtoreduceanysugar﹣drivenhealthrisks.Itcontainstwokindsoffiberwhichformabarrierontheinsideofthesmallintestine肠.Thisbarrierlimitstherateofsugarabsorbingsothattheliver肝isnotharmedjustlikestoppingalargewave5buildinganunderwaterwall.Fruitfiberalso6helpfoodreachthefinalpartofyoursmallintestinesoonersoyoutendtofeelfull7quickaftereatingfruit.Asaresultthechancesyouwillovereatfruitarerelativelylow. Somefruitsmaybebetter8eatthanothers.Forexampleberrieshavebeenlinkedtobothbetterheartandbetterbrainhealth.9grapesmayneedmoreself﹣control.They'remainlylittlebagsofsugar. Ifyoulovewholefruitthere'slittleevidencetoshow10eatingit一evenawholelotofit﹣isbadforyourhealth.
下列有关健康和安全的说法错误的是
下列实验现象描述正确且完整的是
BeneaththewaterintheChina'sQiandaoLakeliesahiddentreasure.TheancientcityofShiChengalsoknownasLionCitylocatedintheprovinceofZhejianghasbeensubmergedunderwaterfor53years.ShiChengwasfoundedabout1300yearsagoinavalleysurroundedbytheFiveLionMountains.WhentheChinesegovernmentdecidedtheyneededanewhydroelectricpowerstation水力发电站adamandman﹣madelakewereconstructedandthecitywasleftatthebottomofthisnewbodyofwater.Nowitsitsatdepthsrangingfrom85feettoabout103feet. MuchliketheMachuPicchuruinsinPeruthisunderwatercityremainedforgottenuntilsomerenewedinterestsleadtoitsrediscovery.QiuFengalocalofficialinchargeoftourismthoughtaboututilizingShiChengforentertainmentonthelakeandasadestinationfordivingclubs.OnSeptember182001scubadiversmadetheirfirstattemptunderwater.Wewerelucky.AssoonaswedivedintothelakewefoundtheoutsidewallofthetownandevenpickedupabrickQiutoldGuangzhouDailyinaninterview.Moreresearchwasconductedanditwasdiscoveredthattheentiretownwasintactt881includingwoodenbeamsandstairs.Aftertheinitialfindingsinternationalarchaeologistsandafilmcrewthenrecordedthepreservationofthelostruins. Lookingatsurfaceofthelakedottedwithover1000islandsyou'dneverknowthatanentirecitywasbelow. It'sincredibletothinkthatafterallthistimethestructurestillremainsintactandwecouldonedayvisitit.UntilthenShiChengwillcontinuetoremaininconspicuouslysubmerged. 1WhywasShiChengcoveredbywateraccordingtothepassage? A.Becausethecityhasalonghistory. B.Becausethegovernmentcouldattractmoretouristsbydoingso. C.Becausethegovernmentneededtobuildapowerstationwhereitwas. D.Themountainssurroundingthecityledtotheconsequence. 2Whatdoestheunderlinedwordinitialmeaninparagraph2? A.Original B.Great C.Wonderful D.Amazing 3WhatisthemostunbelievablepartofShiChengaccordingtothepassage? A.IthassomethingtodowithMachuPicchuruinsinPeru. B.Noonewasinterestedinthelostcityforalongtime. C.Itsstructurekeepsperfectinthewaterforalongtime. D.Thereareover1000islandsprotectingthelostcity. 4Whowillmostprobablycometovisitthelostcity? A.Someonewholikesswimming. B.Someonewholikesdiving. C.Someonewholikesclimbingmountains. D.Someonewholikestakingpictures.
下列变化中不属于化学变化的是
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元素化合价发生改变的反应都是氧化还原反应．下列判断正确的是
区分下列各组物质的两种方法都合理的是
下列事实用微粒的知识解释正确的是
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向一定质量AgNO3和CuNO32的混合溶液中加入Zn溶液质量与加入Zn的质量关系如图所示．下列说法不正确的是
如图是一定条件下碳与水反应的微观模拟图 1在B中补充出相关粒子图形使其正确 2此变化前后发生改变的粒子是 3B→C变化的微观实质是 4此变化属于填基本反应类型．
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人体胃液中的酸是写化学式下同地壳中含量居前两位的元素所形成化合物为．
化学是以实验为基础的科学实验是科学探究的重要途径． 1氢氧化钠可以和酸或某些盐发生复分解反应．复分解反应发生的条件是． 2图1曲线是盐酸和氢氧化钠溶液反应得到的图象． ①该反应的化学方程式为． ②某同学取一滴c点时的溶液滴在洁净的玻璃片上加热蒸干得到白色晶体对于其成分甲同学认为是氢氧化钠和氯化钠乙同学认为是氯化钠丙同学认为是氯化钠和氯化氢．你认为哪位同学的判断正确并说明原因． 3下列仪器常用于实验室制气体的发生装置． ①实验室用A装置制取氧气该反应的化学方程为． ②实验室用石灰石和稀盐酸制取二氧化碳若气体发生装置选用图2中的B装置请简述检验该装置气密性的方法． 4图3装置可做一氧化碳还原氧化铁的实验并检验生成的气体产物． 1实验时B装置中发生的现象为． 2C装置中反应的化学方程式为． 5某同学用该装置进行实验若用200g含氧化铁质量分数为80%的赤铁矿理论上可以炼得纯铁的质量是多少
我国科学家研制出一种新型镁锂合金．该材料具有超轻等特性．下列说法正确的是
人类使用材料的变化标志文明的进步下列制得材料的方法与化学反应无关的是
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ABC三种物质的溶解度曲线如图所示． 1t2℃时把50gA放入50g水中能得到A的饱和溶液其中溶质和溶液的质量比为． 2将t2℃时ABC三种物质的饱和溶液降温至t1℃所得溶液的溶质质量分数的大小关系是． 3将C的饱和溶液变为不饱和溶液可采用的方法．
化学与生活密切相关． 1洗涤剂除油污的原理是 2炒菜用的铁锅手柄是用填“热固性”或“热塑性”塑料做成的 3“漂白粉”的有效成分为次氯酸钙[CaClO2]在空气中它能吸收二氧化碳和水蒸气生成两种化合物其中一种是具有漂白和杀菌作用的次氯酸HClO另一种是白色不溶于水的固体该反应的化学方程式为．
化学与生产生活密切相关．下列说法不正确的是
在平昌冬奥会闭幕式上“北京八分钟”闪耀全场向全世界发出2022年北京冬奥会的邀请． 1演员穿着的“熊猫”道具轻而坚固使用碳纤维复合材料和铝合金管材主要利用了这两种材料具有的共同性能是填字母． A．密度小强度好B．密度大硬度大C．熔点低硬度小 2为保证低温环境下能够完美演出演员们穿着智能发热服．发热服配备聚合物锂电池能够持续发热4小时．发热服在发热过程中的能量转化为①→②→内能． 3“熊猫”穿着的冰刀是由某种特殊钢制成的甲烷和氧化铁在一定条件下可以生成铁同时生成两种可燃性气体一种是单质一种是氧化物．写出此反应的化学方程式①在反应前后铁元素化合价的变化是②．
下列除去物质中少量杂质的方法正确的是
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