20分求详谈排列组合消序我们知道在数学排列组合问题时存在消序。例如四个学生分到3个班，每班最多分两个学生，那么不同方案有

1. Usually, cusotmer will come to our company for exploration first and then discuss equipment related details.
2. About quotation, our quotation validity period is about half a year.
3. About guarantee period, we would deal with quality issues according to different situation, and communication might be needed for detais.
4. We really want to get this order as well as this project. but this set of equipment is a complicated product line, we need to discuss together for production process, brand and other details.
5. We consume that the tenderer should provide more specific details of craft ,criterion or related brands for bidder reference.

翻译：if you receive my message,please have a detail talk with me.

1.they are talking over the plan detailed
why not talking over with your father detailed

要注重教材,先要把书上的例子彻底弄明白,理解概念,切忌死记硬背.当然课后的训练也是很有必要的,但是不要盲目的做题,着重你不懂得类型,其他的一带而过就可以.不同的人有不同的方法,同一个类型的做个集几题基本上就会了,要形成自己的做题方法与风格...我就是这么过来的,希望对你有帮助.最后祝你三年后能考上好大学.

这诗句还是说感情的,就从感情来说吧.
举个例子：
初恋,几乎每个人都必须经历的阶段,而又往往不是最终在一起的.
初恋的恋人,在以后的一生中,都是一个特殊的存在,不同于一般朋友,亲人,陌生人.
也就是永远也不会有人能够取代TA的位置,TA在你心目中是唯一的,即使以后能够遇到更好、更适合你的人,你们在一起了,你也不会忘记曾经的初恋.
当然,在现在,这两句诗已被广泛地用于表达很多别的层面的意思.

Apology letter
Dear Ms Winston,
The purpose of this is to convey to you my sincere apologies for any inconvenience you may have experience last month with respect to the installation of your Internet high speed service.
I just returned from vacation this week and found your file in my in-basket.As soon as I reviewed your case it was clear that somehow your Jau.20th request for a change in service had somehow slipped through the cracks.The only possible explanation I can give is that we have recently had a number of key staff changes,which might have resulted in your letter being overlooked.
Consequently,I have directed our installation group to contact you by the end of this week to set up a time convenient to you when they could go to your house and install your new router and make the necessary adjustments to your software.
Because of this serious oversight,and as a testament to our appreciation of you as out customer ,we are going to provide you with your first three months of high speed service for free charge.There fore,your account will not be billed until June of this year.
Ms.Winston,let me assure you that what happened in your case is not typical of CableNet’s level of customer service.We continue to be committed to providing you and all of our customers with the highest standards of service in the industry.
If you have any questions please don’t hesitate to calll me at*******.
Yours in service
Tony
Manager,customer solutions
2008

广告!怎么解答,去农林网站上宣传下,肯定有人收购

Dear##:
How do you do.It's really a good news.Welcome to talk with us in Beingjing.I will get the invitation ready and send it to you as soon as possible.Please tell me when you will come to Beijing.It's a pity that you and your father couldn't come to Beijing this time.I believe,we will meet each other in a short time.
Sincerly
Your's ##

I would like to talk the detail about this case with you.

1.100个黄球
2.100个红球
3-1红球,大于或等于80
3-2只要同时有红球和黄球即可
3-3红球,小于等于79
我想说这个题目是抓三次,
楼上的考虑的是抓一次的吧