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如图所示是内燃机工作循环中的一个冲程，它是（ ）
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如图是四冲程内燃机工作循环中的一个冲程它是
压缩冲程，将内能转化为机械能
做功冲程，将内能转化为机械能
压缩冲程，将机械能转化为内能
做功冲程，将机械能转化为内能
如图所示的内燃机工作的一个循环中其四个冲程的顺序应当是
乙．甲．丁．丙
甲．乙．丙．丁
乙．丁．甲．丙
甲．丁．乙．丙
如下图所示是内燃机工作的一个循环这四个冲程依次分别是甲__________冲程乙__________
四冲程内燃机在一个工作循环中要顺次完成____________________四个冲程
热机是把能转为能的机器.燃料直接在发动机气缸内燃烧产生动力的热机叫做内燃机常见的内燃机有和两种.四冲
常见的内燃机有和两种四冲程内燃机的一个工作循环是由和四个冲程组成的在一个工作循环中曲轴转动周燃气对活
右图是内燃机工作循环中的一个冲程它是
压缩冲程，将化学能转化成内能
压缩冲程，将机械能转化成内能
做功冲程，将内能转化成机械能
做功冲程，将机械能转化成内能
在如图所示的内燃机工作的一个循环中其四个冲程的顺序应当是
甲乙丙丁
乙甲丁丙
甲丁丙乙
丁丙甲乙
在下图所示的内燃机工作的一个循环中其四个冲程的顺序应当是
乙、甲、丁、丙
甲、乙、丙、丁
乙、丁、甲、丙
甲、乙、丁、丙
内燃机的一个工作循环中机械能转化为内能的冲程是
吸气冲程
压缩冲程
做功冲程
排气冲程
在如图所示的内燃机工作的一个循环中其四个冲程的顺序应当是
乙、甲、丁、丙
甲、乙、丙、丁
乙、丁、甲、丙
甲、乙、丁、丙
如图是四冲程内燃机工作循环中的一个冲程它是
压缩冲程，将内能转化为机械能
做功冲程，将内能转化为机械能
压缩冲程，将机械能转化为内能
做功冲程，将机械能转化为内能
热机是把内能转为机械能的机器.燃料直接在发动机气缸内燃烧产生动力的热机叫做内燃机常见的内燃机有汽和两
四冲程内燃机工作循环的四个活塞行程中只有一个行程是作功的
内燃机的一个工作循环中内能转化机械能的冲程是
吸气冲程；
压缩冲程；
做功冲程；
排气冲程。
如图所示是内燃机工作循环中的一个冲程它是
做功冲程，内能转化成机械能
做功冲程，机械能转化成内能
压缩冲程，化学能转化成内能
压缩冲程，机械能转化成内能
单缸四冲程内燃机的四个冲程的示意图如图所示.下列关于这种内燃机一个工作循环中四个冲程的顺序排列正确的
丙丁乙甲
乙丁甲丙
乙甲丁丙
甲乙丙丁
图6是内燃机工作循环中的一个冲程它是
压缩冲程，将化学能转化成内能
压缩冲程，将机械能转化成内能
做功冲程，将内能转化成机械能
做功冲程，将机械能转化成内能
右图是内燃机工作循环中的一个冲程它是
压缩冲程，将化学能转化成内能
压缩冲程，将机械能转化成内能
做功冲程，将内能转化 成机械能
做功冲程，将机械能转化成内能
单缸四冲程内燃机的四个冲程的示意图如图所示下列关于这种内燃机一个工作循环中四个冲程的顺序排列正确的是
丙、丁、乙、甲
乙、丁、甲、丙
乙、甲、丁、丙
甲、乙、丙、丁
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如图在平行四边形ABCD中点E在边BC上连结AEEM⊥AE垂足为E交CD于点MAF⊥BC垂足为FBH⊥AE垂足为H交AF于点N点P是AD上一点连接CP． 1若DP＝2AP＝4CP＝CD＝5求△ACD的面积． 2若AE＝BNAN＝CE求证AD＝CM+2CE．
如图△ABO∽△CDO若BO＝6DO＝3CD＝2则AB的长是
每年夏季全国各地总有未成年人因溺水而丧失生命令人痛心疾首．今年某校为确保学生安全开展了“远离溺水•珍爱生命”的防溺水安全知识竞赛．现从该校七八年级中各随机抽取10名学生的竞赛成绩百分制进行整理描述和分析成绩得分用x表示共分成四组A．80≤x＜85B．85≤x＜90C．90≤x＜95D．95≤x≤100下面给出了部分信息 七年级10名学生的竞赛成绩是998099869996901008982 八年级10名学生的竞赛成绩在C组中的数据是949094 七八年级抽取的学生竞赛成绩统计表 根据以上信息解答下列问题 1直接写出上述图表中abc的值 2根据以上数据你认为该校七八年级中哪个年级学生掌握防溺水安全知识较好请说明理由一条理由即可 3该校七八年级共720人参加了此次竞赛活动估计参加此次竞赛活动成绩优秀x≥90的学生人数是多少
如图在平面直角坐标系中矩形ABCD的顶点AD分别在x轴y轴上对角线BD∥x轴反比例函数y＝k＞0x＞0的图象经过矩形对角线的交点E．若点A20D04则k的值为
某校学生“汉字听写”大赛成绩的频数直方图每一组含前一个边界值不含后一个边界值如图所示其中成绩为“优良”80分及以上的学生有人．
计算 1x+y2-y2x+y 2a+÷
ISMisalargecompanyinSt.LouisMissouributthetopleadersarenotsatisfiedwiththeperformanceofitsstaff.Onedaynottoolongagotheemployeesreturnedfromtheirlunchbreakandweregreetedwithasignonthefrontdoor.Thesignsaid1Weinviteyoutojointhefuneralintheroomthathasbeenpreparedinthegym. Atfirsteveryonewassadtohearthatoneoftheircolleagueshaddiedbutafterawhiletheystartedgettingcuriousaboutwhothispersonmightbe.Theexcitementgrewastheemployeesarrivedatthegymtopaytheirlastrespects.Everyonewondered2Wellatleasthe'snolongerhere! Onebyonetheemployeesgotclosertothecoffinandwhentheylookedinsideittheysuddenlybecamespeechless.Theystoodoverthecoffinshockedandinsilenceasifsomeonehadtouchedthedeepestpartoftheirsoul.3TherewasalsoasignnexttothemirrorthatsaidThereisonlyonepersonwhoiscapabletosetlimitstoyourgrowthitisYOU. Youaretheonlypersonwhocanrevolutionizeyourlife. 4 Youaretheonlypersonwhocaninfluenceyourhappinessyourrealizationandyoursuccess. Yourlifedoesnotchangewhenyourbosschangeswhenyourfriendschangewhenyourparentschangewhenyourpartnerchangeswhenyourcompanychanges. YourlifechangeswhenYOUchangewhenyougobeyondyourlimitingbeliefs5 A.Therewasamirrorinsidethecoffineveryonecouldseethepersonwhopassedaway B.Whoisthepersonthatpassedaway? C.whenyourealizethatyouaretheonlyoneresponsibleforyourlife. D.Amirrorinsidethecoffineveryonewholookedinsideitcouldseehimself E.Yesterdaythepersonwhohasbeenlimitingyourgrowthinthiscompanypassedaway. F.Youaretheonlypersonwhocanhelpyourself G.Whoisthispersonthatwaslimitingyourprogress?
下列各数中比-1小的数是
在初中阶段的函数学习中我们经历了“确定函数的表达式--利用函数图象研究其性质一一运用函数解决问题“的学习过程．在画函数图象时我们通过描点或平移的方法画出了所学的函数图象．同时我们也学习了绝对值的意义|a|＝． 结合上面经历的学习过程现在来解决下面的问题在函数y＝|kx-3|+b中当x＝2时y＝-4当x＝0时y＝-1． 1求这个函数的表达式 2在给出的平面直角坐标系中请用你喜欢的方法面出这个函数的图象并写出这个函数的一条性质 3已知函y＝x-3的图象如图所示结合你所画的函数图象直接写出不等式|kx-3|+b≤x-3的解集．
假定你是李华想邀请网友Peter下周六参观你校举办的科技小发明technologygadgets展览.请给他写封邮件内容包括: 1.具体时间和地点; 2.展览目的和内容. 注意: 1.词数100左右; 2.可以适当增加细节以使行文连贯;
计算π-30+-1＝．
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