【摘 要】
:
交通运输源远流长陈燮阳,乔惠英本文权作本专栏的开篇,先与读者见面了。衣、食、住、行是人类生存的四大要素。人类的进步和文明在许多方面是通过衣、食、住、行表现出来的。交
论文部分内容阅读
交通运输源远流长陈燮阳,乔惠英本文权作本专栏的开篇,先与读者见面了。衣、食、住、行是人类生存的四大要素。人类的进步和文明在许多方面是通过衣、食、住、行表现出来的。交通运输就是“行”;这是人类发现自然、利用自然、进行创造发明的一个重要领域,历史悠久,源...
Transport has a long history Chen Xieyang, Qiao Huiying This right of writing for the opening of this column, first met with the reader. Clothing, food, shelter, travel is the four elements of human existence. In many ways, human progress and civilization are manifested through clothing, food, shelter and transportation. Transport is the “line”; it is an important area for mankind to discover nature and use nature to create inventions, and has a long history of ...
其他文献
The Songhua River,the third largest river in China in terms of discharge,drains the well-known organic-rich black soil region in Northeast China.Over the la
When the energy of a river reaches a minimum required to transport an imposed sediment load,a special equilibrium state is achieved within a single channel
列车提速将使横向无联结的并置混凝土梁横向振幅严重超限问题亟待解决,以适应提速要求。文章介绍并置梁的横向加固技术,以及提速试验结果。
The speeding up of trains will m
一年来我们财政工作上获得许多成绩,完成了中央所给予的任务,而且超过了任务,但是在收支制度上还存在着严重的问题,如各种税收的征起数与解库数有很大的差额,税款上解不及时
静脉曲张是一种不可逆转的血管病,即使不痛不痒,也要及时就医.如果医生诊断有继续发展的可能,就应考虑早期手术.很多人出现静脉曲张后,不及时前往医院检查治疗,而是选择尝试
The rich fish diversity of river Ganges basin and its threatened status in the current context highlights the need for a large scale study to identify prior
MicroRNAs (miRNAs) are endogenous 21-24 nucleotide single-stranded RNAs and play important roles in gene expression, development, cell cycles and environmen
Several authors have reported that soil erosion and the chemical,physical processes are linked to the aggregate size and stability,whose determination is fa
“十月怀胎,一朝分娩”,看似简单的八个字,背后却饱含了每一个准妈妈十个月的艰辛和蜕变.从孕早期出现早孕反应的各种不适,到孕中期闯关一样的各种排畸检查,到孕晚期随之而来
Extensive research into the changing sediment load throughout the Yangtze River (Changjiang) basin has been completed over recent years,and it provides an o