– Mike, did you see Mr. Chapman in the office just now?

英语邀请信?
大家觉得我这样写写得对吗?有没有错误,请帮我指证一下.
Dear Mr.chapman,
I speak on behalf of Board of Dalian Daxin chemicals corporation invite you to attend the 10th anniversary commemoration of the company,time is August 1 to 3.
we are partners.so ,we will arrange to meet you and the general manager,Together to discuss our long term cooperation.
Thank you
Sincerely,
Rosita

这是一篇英语阅读的开头,求阅读答案啊 Marian Chapman a grandmother w
这是一篇英语阅读的开头,求阅读答案啊
Marian Chapman a grandmother who was born in Colombia in the 1950s

英文邀请信.要点是王先生想邀请chapman先生参加他们公司在八月一日到三日举行的十周年庆典.他还安排c...
英文邀请信.要点是王先生想邀请chapman先生参加他们公司在八月一日到三日举行的十周年庆典.他还安排chapman先生与DDCC总经理李先生会晤谈谈未来合作事宜.亲本人英语水平不高各位朋友帮助一下

Mr. Chapman retired at 70 after he _____ nearly 40 years with the Gas Company.

[ ]

A. had spent B. has spent C. spends D. would spend

英语翻译
是关于火电厂底灰和粉煤灰处理的,括号里的不用翻译,人名不用翻译
Bailey and Chapman (1987) studied the effect of the addition of fluoride ions on the extraction of aluminum from coal ash materials.The addition of fluoride ions led to a dramatic increase in the rate of extraction of aluminum.This increase in yield was found to be independent of the source of fluoride,depending only upon the fluoride concentration in the leaching mediumand on the thermal history of the feed material.The very high yields of aluminum in relatively short extraction times observed at a fluoride concentration of 0.68 Mfor uncalcined samples and those calcined at temperatures below 850 ℃.Samples calcined at temperatures above 850 ℃ required higher concentrations of fluoride in order to obtain satisfactory recoveries of aluminum.
Singer et al.(1982) tested aluminum extraction from two fly ashes by commercial and microbiologically produced citric acids.Up to 12% Al2O3 of the total was extracted at fly ash:extractant ra- tio of 1:100 w/w,temperature 60 ℃ and shaking for 21 h.Extraction efficiency is considerably affected by extracting acid concentration and extraction temperature.The extraction efficiency of microbiologically produced citric acids was only slightly lower than that of commercial citric acid of equal concentration.