一、山区修建公路是沿等高线还是尽量选最近路线几十年前,由于生产力水平低下,经济实力较弱,许多国家在山区修筑的多是盘山公路,公路路线多与等高线平行(沿某一等高线延伸),呈“之”字形,如我国始建于1935年初,1936年9月全线竣工通车的矮寨山盘山公路,1990年建成的梧桐山盘山公路等。而21世纪的今天,不仅科技高度发达,而且已有很强的经济实力,架 First, the mountain road is built along the contour line or try to select the most recent route A few decades ago, due to the low level of productivity, economic strength is weak, many countries in the mountains are mostly built Panshan highway, highway routes and contour lines and more parallel Such as Aizhai Mountain in Panshanshan, which was opened to traffic in September 1936 and completed in September 1936, and Wutongshan Panshan Highway, which was completed in 1990. In the 21st century, not only science and technology are highly developed but also have strong economic strength.