The objectives of this research are to get a methods of high quality forage production to increase cost feed efficiency, and to get an alternative concentrate for calves. This research is divided into three steps of experiment. The first experiment, analyzing production and nutrient com herbage ...
An automated [15O]H2O production and injection system for PET imaging A computer controlled []injection system has been designed for multiple bolus injections during PET cerebral blood flow studies. The system is housed in a ... BM Palmer,M Sajjad,DA Rottenberg - 《Nuclear Medicine & Biology》...
苏宁易购为您提供宏碁(acer)SF714-52T-7312轻薄本和宏碁(Acer)暗影骑士·擎 GTX1650Ti-4G十代酷睿i5 AN515-55 15英寸电竞游戏本学生笔记本电脑(i5-10300H 8G 512G 144Hz 72色域)参数对比,让您了解宏碁(acer)SF714-52T-7312轻薄本和宏碁(Acer)暗影骑士·擎 GTX1650Ti-4G十
在正项数列{an}中,a1=1, a 2 n + 1 - a 2 n = 1 ,记 b n = 1 ( a n + 1 ) ( a n + 1 + 1 ) ( a n + a n + 1 ) .整数m满足lg(10119+1)<m<lg(10120+1),则数列{bn}的前m项和为( ) 【考点】裂项相消法. ...
Predicting the risk of chronic kidney disease in the UK: an evaluation of QKidney® scores using a primary care database. Chronic kidney disease is a major health concern that, if left untreated, may progress to end-stage kidney failure (ESKF). Identifying individuals at an in... G Colli...
(2)由(1)知,an=3×( 2 3 )n-1,所以数列T(2)的首项为t1=a2=2,公差d=2a2-1=3,S2007=2007×2+ 1 2 ×2007×2006×3=6043077,即数列的前2007项之和为6043077. (3)(理)bi=ai+(i-1)(2ai-1)=(2i-1)ai-(i-1)=3(2i-1)( ...
在等比数列{an}中,已知a1+a2+a3=1,a4+a5+a6=-2,则该数列的前15项的和S15=. 试题答案 在线课程 【答案】分析:由于等比数列中,每3项的和仍然成等比数列,求出 a7+a8+a9=4,a10+a11+a12=-8,a13+a14+a15=16,从而求得S15的值. 解答:解:由于等比数列中,每3项的和仍然成等比数列,a1+a2+a3=1,a4+...
标准号:NF L10-714-2008 中文标准名称:航空航天系列.FE-PA2601(X6NiCrTiMoV26-15)型耐热合金.a/D≤200mm的非热处理锻坯 英文标准名称:Aerospace series - Heat resisting alloy FE-PA2601 (X6NiCrTiMoV26-15) - Non heat treated, forging stock a or D < or = 200 mm. ...
A new batch of relics, including thousands of bronze coins, have been unearthed from the remains of a mint dating back more than 2,000 years in Xi'an, the capital of Northwest China's Shaanxi province. Apart from the coins of...
本句的主干为 A comparison … reveals not simply … but also…。of British geological publications over the last century and a half 作定语,修饰 A comparison。not simply … but also … 作并列宾语,what constitutes an acceptable research paper...