平面群化结构作业图片

6个球放入4个盒子 问有多少种放法 (条件在下面哈`) 1盒子不同 球不同2盒子不同 球不同 且每个盒子都要有球3盒子不同 球相同4盒子不同 球相同 且每个盒子都要有球5盒子相同 球不同 且每个 利用恒等变形求极限lim(1+x)(1+x^2)...(1+X^(2^n)),n趋于无穷,x的绝对值 father bedroom kitchen friend bathroom brother sister living room 分类求 你 们 快 快 living room,attic,bathroom,bedroom,kitchen,basement,staircase,office/study/den,dining room的中文意思 Usually ,each room has i_1__ own living room,bedroom,kitchen and bathroom. 用bathroom,bedroom,living room,kitchen,cook编一个英语小故事 Life-Cycle Cost Methods And Tools 中文翻译 恒等变形题的基础题,（X的4次方+8X平方-2X-11）/（X+1）结果是X立方-X平方+9X-11 在图示的电路中,电源电压为220V;R1、R2、R3为定值电阻,但是他们的具体电阻数值都没有标注,知道他们电阻的可能值是44Ω、88Ω、176Ω或220Ω.闭合开关S,在断开S1、S2与闭合S1、S2两种状态下,电流 学校物理活动小组制作了一种电子称,实际上是压力测量计,用它来称量物体的质量,其原理结构如图所示.图中A为金属片,B为金属板,R1=24欧.R2=24欧,R2是滑动变阻器,电源电压为10V且保持不变.问当 I didn’t see her in the meeting-room this morning.She____at the meeting. （d） A.mustn’t have spoken B.shoudn’t have spoken C.needn’t have spoken D.couldn’t have spoken she ____(清洁) her room this morning. I saw her ______ the room this morning. (enter)我知道填enter是对的（see sb. do sth.）,那可以填entering吗? 为什么? the life and work of professor roy millen译文和中心思想!我需要的是文章的译文,或者是文章大概和中心思想~ the life and work of professor Roy Millen的中心思想和文章大概,寫作背景! They young man is ()carry that heavy bagThey young man is ()carry that heavy bag a.strong enough to b.ehough strong to c.not strong enough d.strong enough 这题为什么选b,b选项为什么有to, the yong man is( )carry that heavy bag.A.strong enough to B.enough strong to C.not strong enough D.strong enough ____the room,a letter was laid on the ground.A.Entering B.Having entered C.He entered D.Mrs GrD.Mrs Green entering 为什么C不行呢 Their room was on the third floor,its window ( )the sports ground.A.overlooks B.overlooking C.overlooked D.to overlook求详解 （ ）the room,a letter was found on the ground.A.Entering B.Having entered C.Entered D.Mr Green entering Entering the room,I found mary ____at the desk and ____a letter.A.seated; writing B.seating; writing.答案选A.问:关于seated的用法有: be seated; seated oneself.怎么会出现这么一道题不是以上格式的呢? 是不是应该填sit The writer is in the room,he is writing a letter的合并句 物体间的摩擦力的产生是接触面不光滑的原因造成的,这只是表面现象,你能从其他的角度猜想一下摩擦力产生的原因吗? 物理变态题2参照物的选取是任意的,选择不同的参照物,描述同一物体的运动时,结论也不一样,那么,为什么要选取不同的参照物呢? What’s the weather like today?的答语是It's warm还是It's sunny?What’s the weather like today?答语是It's warm还是It's sunny? 一道变态的物理题一作匀减速直线运动的物体,经过A点时速度为3米每秒,2秒后经过B点,已知A、B点距离为10米,求物体运动的加速度和经过B点时的速度? He often help with t( )English and and they also tell him h( )to speak Chinese well.首字母填空 Carol s. English and they often heip e. other.“.”处为空,填写字母. The young man insisted that he (had done) nothing wrong and (should be set)free.为何用括号中词? The young man insisted that he____nothing wrong and _____freeB.had done ;should be set_____free 这个 空用了虚拟了 ,为什么前面 ____nothing 不用 should do The man in prison insisted that he ___ nothing wrong and ___set free.A.had done,should be B.should do,should beC.had done,had been D.should do,had been The young man insisted that he______ these watches and______free.A.stolThe young man insisted that he______ these watches and______free.　　A.stole,set B.had stolen,be set C.steal,be set D.had stolen; must be set为何选B