【摘 要】
：
At 18:27 Beijing time on March 31, China put theAPSTAR 7 satellite into its preset orbit by a LM-3B launch vehicle from the Xichang Satellite Launch Center. 26
论文部分内容阅读
At 18:27 Beijing time on March 31, China put theAPSTAR 7 satellite into its preset orbit by a LM-3B launch vehicle from the Xichang Satellite Launch Center. 26 minutes after the lift-off, the satellite separated with the rocket carrier and entered precisely the geostationary transfer orbit with a perigee of 209km, an apogee of 50419km and
At 18:27 Beijing time on March 31, China put the APTAR 7 satellite into its preset orbit by a LM-3B launch vehicle from the Xichang Satellite Launch Center. 26 minutes after the lift-off, the satellite separated with the rocket carrier and entered precisely the geostationary transfer orbit with a perigee of 209km, an apogee of 50419km and
其他文献
美国霍普山(Mt Hope)工程，是对负荷反应最快的抽水蓄能工程，其开发工作已完成一半，帕特里克·雷诺兹先生考察了州的作用。
BACKGROUND The prognosis of hepatocellular carcinoma(HCC)patients remains poor despite advances in treatment modalities and diagnosis.It is important to identif
叉头框转录因子O亚型1(FoxO1)作为人体重要的转录因子,参与细胞代谢、生长、分化、氧化应激、衰老、自噬等多种生理和病理过程,其转录活性受多个上游通路翻译后修饰和细胞核-
摘要：机械化保护性耕作,在生产上又被称作免耕或少耕,指的是在满足作物正常生长基础上尽量减少田间作业，将农作物的秸秆进行粉碎还田，让其覆盖地表，达到蓄水保墒的目的，采用机械化和半机械化措施保证播种质量。其技术实质是通过残茬覆盖地表和简化耕作，减少水土流失，培肥地力、保护环境和资源。 关键词：机械化保护性耕作；优点；存在问题；对策与建议 中图分类号：S345；S233.1 文献标识码：A 文章编号
据马丁·欣德利报道：新西兰电力公司(ECNZ)马蚋普里水电站增容的计划已获批准。
在作物生长时期,通过土壤培肥、合理施肥等措施,促使作物根系发达,吸收水分养分能力增强,生长健壮,产量质量提高,肥水利用率也有较大提高,这就需要综合利用一些水肥管理技术,
<正>The Venesat-1 communications satellite(Venesat-1),which was successfully launched on October 30,2008,is five years old.In the five years,Venesat-1 has opera