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如图1所示，两个完全相同的导热性能良好的汽缸P、Q放在水平地上，分别用相同的活塞封闭相同质量的理想气体，汽缸足够长，活塞不会脱离汽缸．已知的活塞质量为m，横截面积为S，气缸的质量为M，外界大气压为p...
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高三下学期物理《》真题及答案
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同一种水垢疏松多孔的比致密坚硬的导热性
大很多
小很多
完全相同
基本相同
一个条形橡皮擦放在水平桌面上下列说法①它的硬度大于铁的硬度②它的导热性比铜的导热性差③使用后其密度保
①②④
③④
①②⑤
②③
用密封性能良好的活塞把一定质量的理想气体封闭在导热性能良好的汽缸中汽缸的内壁光滑.现将汽缸缓慢地由水
气体分子的平均速率不变
气体分子的平均动能变大
气缸内壁单位面积上受到气体分子撞击的平均作用力不变
气缸内气体的分子数密度变大
如图所示室内恒温分别将三个相同的温度计放在空气中水杯中加盖的水杯中水杯导热性良好示数稳定后请排列的高
青铜具有.
良好铸造性能
极好的导热性
良好的低温性能
极好的导电性
如图1所示两个完全相同的导热性能良好的汽缸PQ放在水平地上分别用相同的活塞封闭相同质量的理想气体汽
为了比较铜和铝的导热性能小军选取了粗细均匀横截面积长度均相同的U.形铜棒和铝棒进行实验.小军认为导热
一个密闭的圆柱形气缸竖直放在水平桌面上缸内有一与底面平行的可上下滑动的活塞将汽缸隔为两部分.活塞导热
为了比较水和沙子容热本领的大小小明做了图所示的实验在2个相同的烧杯中分别装有质量初温都相同的水和沙子
某新型铸铁材料具有一定的韧性和较高的耐磨性同时又有良好的铸造性能和导热性主要用于生产汽缸 盖汽缸套钢
普通灰铸铁
蠕墨铸铁
可锻铸铁
球墨铸铁
具有一定的韧性和较高的耐磨性同时又具有良好的铸造性能和导热性在生产中主要用于生产汽缸盖汽缸套钢锭模和
可锻铸铁
灰口铸铁
球墨铸铁
蠕墨铸铁
如图甲所示一导热性能良好内壁光滑的汽缸水平放置横截面积S=2×10﹣3m2质量m=4kg厚度不计的活
如图所示室内恒温分别将三个相同的温度计放在空气中水杯中加盖的水杯中水杯导热性良好示数稳定后请排列的高
是青铜的性能
良好的铸造性能
极好的导热性
良好的低温性能
极好的导电性
如图1所示两个完全相同的导热性能良好的汽缸PQ放在水平地上分别用相同的活塞封闭相同质量的理想气体汽
轴瓦材料具备性能才利于热量的散失和抵抗润滑油的腐蚀
良好的导热性
良好的耐蚀性
良好的导热性及耐蚀性
高的耐磨性
具有一定的韧性和较高的耐磨性同时又具有良好的铸造性能和导热性在生产中主要用于生产汽缸盖汽缸套钢锭模和
可锻铸铁
灰口铸铁
球墨铸铁
蠕墨铸铁
下列有关石蜡的理化特性描述正确的是
热容量大
导热性大
良好的带热体
导热性小
蓄热性能大
铜具有良好的导电性导热性低温力学性能易于__________和__________
炉膛要有良好的以减少热量损失
密封性能
绝热性能
耐热性能
导热性能
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在△ABC中AB＝3AC＝2∠BAC＝60°点P是△ABC内一点含边界若则||的取值范围为
为做好达州市渠江航道升级的前期工作四川省交通运输厅交通勘察设计院组织专家到渠江现场踏勘现要测量渠江某处BA两岸的距离如图在B的正东方向选取一点C测得CB＝2kmA位于C西偏北60°A位于B北偏东15°则BA的距离＝
已知命题命题q若a＜b则则下列为真命题的是
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九连环是我国古老的一种智力游戏它环环相扣趣味无穷九连环由九个大小相同的圆环依次排开镶在铁丝框架上．玩九连环就是将九连环按照一定规则从框架上解下或套上．用Kn表示解下n个圆环所需移动的最少次数已知K1＝1K2＝2通过规则可知Kn＝Kn﹣2+2n﹣11≤n≤9n∈N则K5＝．
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在△ABC中sinAsinBsinC成等差数列sinC﹣+sinC+＝sin2C且＝32则|AB|＝
Becominganeffectiveandefficientstudentisnotsomethingthathappensovernightbutputtingafewofthesetipsintodailypracticecanhelpyougetmoreoutofyourstudytime. Focusonlearninginmorethanoneway.Insteadofjustlisteningtoapodcastwhichinvolvesauditory听觉的learningfindawaytorepeattheinformationbothverbally口头地andvisually.Youcandescribewhatyoulearnedtoyourfriend.1. Teachwhatyou'velearnedtoanotherperson.Startbytranslatingtheinformationintoyourownwords.2.Someideasincludewritingablogpostcreatingapodcastorparticipatinginagroupdiscussion. Gainpracticalexperience.Ifyouaretryingtoacquireanewskillorabilityfocusongainingpracticalexperience.3.Ifyouarelearninganewlanguagepracticespeakingwithanotherpersonandsurroundyourselfwithlanguage﹣immersionexperiences. 4.Weknowlearningisn'taperfectprocess.Sometimesweforgetthedetailsofthingsthatwehavealreadylearned.Ifyoufindyourselfstrugglingtorecallsomeinformationresearchshowsthatyou'dbettersimplylookupthecorrectanswerbecausethatrecallingmayresultinlearningtheerrorstateinsteadofthecorrectresponse. Understandhowyoulearnbest.Anothergreatstrategyforimprovingyourlearningefficiencyistorecognizeyourlearninghabitsandstyles.5.Thenyourlearningefficiencycanbeimprovedgreatly. A.Recallingresultsinthewronganswer. B.Lookupanswersratherthanstruggletoremember C.Nextfindsomewaystosharewhatyou'velearned. D.Youcanapplyitbysharingyournewlylearnedskills. E.Ifitisasportofathleticskillperformtheactivityregularly. F.Thathelpsyougainabetterunderstandingofhowyoulearnbest. G.Intheprocessyoucanmaketheknowledgemorepermanentinyourmind.
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已知实数xyz则下列命题正确的是
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若a＜b＜c则下列结论中正确的是
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直线l1y＝x+1中若l1l2关于x轴对称则l2的倾斜角
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近年来国资委党委高度重视扶贫开发工作坚决贯彻落实中央扶贫工作重大决策部署在各个贫困县全力推进定点扶贫各项工作取得了积极成效某贫困县为了响应国家精准扶贫的号召特地承包了一块土地已知土地的使用面积以及相应的管理时间的关系如表所示 并调查了某村300名村民参与管理的意愿得到的部分数据如下表所示 1求出相关系数r的大小并判断管理时间y与土地使用面积x是否线性相关 2是否有99.9%的把握认为村民的性别与参与管理的意愿具有相关性 3若以该村的村民的性别与参与管理意愿的情况估计贫困县的情况则从该贫困县中任取3人记取到不愿意参与管理的男性村民的人数为x求x的分布列及数学期望． 参考公式 其中n＝a+b+c+d ．临界值表 参考数据≈25.2
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