雙曲線與橢圓共焦點且正焦弦長為

第一类曲线积分 他说的对称性原理是什么意思? 充气娃娃是什么意思啊?谢谢了,大神帮忙啊讲详细点 如何写Makefile I don't think that it's time you worked hard at English为什么用worked hard用过去式 怎么写Makefile It's just the down time between missions that's hard, you know? 什么意思? is it of much consequence to you that the goverment is having a hard time nomeaning? It's time for anything that i-----------you 汽车发动机故障灯亮起,今早发动车子热车后行驶出大概1公里,车子的发动机故障灯亮起了,（昨天下午刚保养了车子,但只是换机油,机滤,和空滤）,在发动机故障灯亮起后行驶没用异常感觉,到 怎么写Makefile 选择填空：The rest of the students -------- not allowed to leave the classroom at that time.A areB isC wasD were -Why _ the rest of the students not allowed to take exercise after class?-Because they didn't finish their homework.A.have B.is C.were D.was是用C还是D呢?虽然后面是学生的复数形式,但the rest of 表示剩余的部分,表示剩余的学 It's time to take a rest,but the students go on writing in the classroom.翻译中文 光合作用的能源是什么?——————初中生物 1.Be quick,( ) we will be late for the football matchA and B but 2.( )is the way ( ) the cinema?C or A what of B where go C which to能给我讲下为什么吗？ The contest ____next Friday,A.will be taken place.B.will take place C takes place D took place Yesterday all of my classmates went to People's Park and___our picture___.A.had,take B.had,taken C.had,taking D.had,to take All my classmates went to the cinema yesterday（ ）me .填介词 ---How many of you went to the zooo yesterday?---_________.A.Nobody.B.Nothing C.None D.Anybody 常见有机物都有哪些常见的至少含有7个碳原子的有机物啊请提供化学式和用途（不用太详细） ABS和ASE是什么意思?关于汽车的. 常见的有机物要化学式四种以上谢谢要化学式不是中文，中文我也知道 英语翻译就是冰河的歌.要是自动翻译就死远一点吧,Once Again I'm longing,for your hungry touchPicture when you on me,I'm missing you so muchYou turn on light imagination,goal your follow wayAnd in my fantasy you came my body,I need stronger kanye west的中文翻译 世界上有血是黄色的动物吗 英语翻译求英语高手翻译~I'm having a better day today than I was yesterday.it would be nice for us to go for a walk.one day I feel that I might send for you will you come if I do. 什么动物吃黄色食物 Last weekend we went to visit our grandma to celebrate her _____ birthday.(eighty) 玻璃木是什么木 玻璃木是什么 玻璃和木哪种硬些? 玻璃餐桌和木餐桌哪个贵