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航天概论结课论文英文

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shindou_2002

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飞行器大致可分为航空器、航天器、火箭和制导武器4类:。 航空器:在大气层内飞行的飞行器称为航空器,如气球、滑翔机、飞艇、飞机、直升机等。它们靠空气的静浮力或空气相对运动产生的空气动力升空飞行。可以分为轻于空气的航空器、重于空气的航空器、固定翼航空器、旋翼航空器、扑翼机等。 航天器:又称空间飞行器。按照天体力学的规律在太空运行的各类飞行器。它们在火箭的推动下获得必要的速度进入太空,然后在引力作用下完成轨道运动。具有多种分类方法,按照应用领域可分为军用航天器、民用航天器和军民两用航天器,这三种航天器又都可以分为无人航天器(人造卫星、空间探测器和货运飞船)和载人航天器(载人飞船、空间站和航天飞机、空天飞机)。 火箭:是以火箭发动机为动力的飞行器,可以在大气层内,也可以在大气层外飞行。 制导武器:是一种携带战斗部,依靠自身动力装置推进,由制导系统导引控制飞行航迹,导向目标并摧毁目标的飞行器,如末敏弹、导弹。导弹按射程可分为洲际、远程、中程和近程等。

航天概论结课论文英文

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xiao学第

Civil engineering in the long history of mankind "science and technology" as a system of civil engineering activity a substantial production processCivil engineering and construction of engineering science and technology it refers to the engineering construction collectively objects, namely, ground, built in underground engineering facilities also refers to water used materials, equipment and inspection in design, construction, maintenance, repair, etcAs an important basis for civil engineering discipline is the important attribute: comprehensive social economic and practical technology with human society advances art unity and development of civil engineering has been turned into a large-scale integrated disciplines and have many branches such as: the railway engineering construction engineering construction bridge engineering specialty structure of water and wastewater engineering of port engineering environment engineering disciplines such as water conservancy project consists of six major in civil engineering, architecture, city planning and civil engineering construction environment and water drainage engineering and equipment engineering road and bridge projectThrough a semester civil engineering introduction lessons I have deeply felt civil engineering covers a wide appreciates the previous achievements also realized as a civil engineer major responsibility, of course, we can't make brilliant achievements is immersed in the immobilized we shall also keep pace with The Times to go to think to dig the imagination to innovation in China's future as a civil engineer I want with civil engineering history with China's national conditions and the situation of the world talk of civil engineering road of the future!
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