多元函数求极值

1 The earthquake which happened in YuShu _____14 th April 2010 was a big disaster.A at B on C in D to 2 ---Where is George?He said he would meet me here at 3:30.---He seems ____with Mr Brown in the office.A to talk B to be talking C to have talked D 完形填空.How time flies!I miss you very much.How I wish I couldDear Lily,How time flies!I miss you very much.How I wish I could_36__ with you I'm a __37_ here,you know.I have so _38__ problems in the new city.I wish to _39__ your adice soon.When wish you a very happy new years I wish a very very very HAPPY BIRTHDAY 请问有这样的用法么? I Miss You,So Come To See You．I Wish You Happy Everyday 这句话应该如何理解呢? 苏联与我国是否为邻国? 英语 单选 语法1.Efforts were made______that everything would be ready before the guests arrived.A)to ensure B)ensuring C)to have ensure D)being ensure这题答案是A,可是固定搭配是make so.do sth.为什么会选A呢,好像是还原to,希 英语单选语法问题——There's somebody at the door,Mr.Corleone——Tell ( ) I'm out.A it B them C her D somebody我知道CD肯定不对,在AB徘徊很久,想知道为什么A错B正确 请教几道英语单选：这些错题我弄不懂, 给定一个cDNA序列,如何表达,纯化到蛋白质? CDNA如何克隆 T载体克隆为什么要用cDNA i haven't seen my parents for a long time,so i m___them very much.首字母. 【 】 from his parents for a long time he was worried about themA not hearing B heard not D not heard 这三个选项哪里错了 I haven't written to my parents for a long time.同义句改写 好久没联系了能用英语这样说吗 didn't contact for a long time very much哪里有语法上的问题? 内含子可以转录为什么不能编码蛋白质? 高考 1、在真核细胞的基因结构中,为什么外显子能够编码蛋白质序列,而内含子不能编码蛋白质序列?2...高考 1、在真核细胞的基因结构中,为什么外显子能够编码蛋白质序列,而内含子不能编码 为什么编码蛋白质基因的内含子范围内的突变有时是有害的 在真核细胞中,能够编码蛋白质的基因中含有?为什么是若干个外显子和内含子?内含子不是不能编码蛋白质? i haven't seen him for a long time 什么意思 C语言中if的具体用法!if(表达式);if(表达式);和ifelse和ifif else有什么区别呢? 一首女声英文歌 声音很甜 有一部分有好几个maybe 好像有一个maybe feel 好像后面还有 i love you 什么的- 一首英文歌、是一个女生唱的.歌词中有 maybe smile maybe cry 还有i love you 的.求歌名.还有一首;歌词中有“ 生死相许又如何” 求歌名 这个句子怎么理解?Then the east brightensThen the east brightens ,and the wind relaxes ---the stars ,its source ,grown dim .句子的语法结构分析:grown dim .在句中做什么成分?/..路过帮个忙...急.....也有人说,grown dim 是 英语单选词辨析2.--- Is the White House ________ to ordinary people?--- Of course.A.accessible B.available C.reasonable D.adjustable选A A和B一般怎么区分谁能解释一下 hurry,then,if you want to catch the bus.句中的then怎么理解 急求几道英语单选16、There was nothing we could do ______.（1分） A、but wait B、except to wait C、only to wait D、but waiting 17、No two people in the world see things exactly ______.（1分） A、alikely B、like C、likely D、al Then I went to the park.改成一般疑问句怎样改?（Then 过期不候 几道英语词型转换1)You must find the manager_______.(he)2)I hate to see letters_________in pencil.(write)3)Frieda sees her parents________every two months,or something like that.(one)4)The reading-room is always_______of students at noon.5)Jac 一首女声的英文歌 好像有好几句dear dear dear还有here here here,最后一句是she was here在商场听到的 可能不准 有没有类似于 she is my sin 类型的英文歌?男声的.