Through careful analysis of the raw materials and comparison to known source regions , archaeologists have shown that some of the raw materials used by the early ravi craftsmen arrived at the site from 300 to 800 kilometers away 经过仔细分析并与各地原料比对,考古学家发现早期拉维工匠所用的原料,有些来自300 ~ 800公里外。
The west , south , southeast and northeast of the source regions of the three rivers abutting with the biodiversity center own a variety of ecosystems and corresponding ample species 这种生物多样性是随着青藏高原的隆起而产生和发展起来的并以其环境为生存条件,因而比较独特,不乏特有种、珍禽异兽、名贵药材和受到国家保护的物种。
The middle route project transfers some water from danjiangkou reservoir , but it changes the relationship of water resource utilization in water source region when resolving water shortage problems in north china 南水北调中线工程从丹江口水库调走部分水量,在解决我国北方地区缺水问题的同时,也在一定程度上改变了汉江中下游地区水资源供需关系。
Based on 1986 tm and 2000 etm data , the land use and landscape pattern change in the source region of the yangtze river was studied with geographical information system ( gis ) and the analytic method of landscape ecological spatial patterns in both spatial and temporal aspects in this paper 摘要长江源区是我国重要的水源涵养区,也是高海拔地区生物多样性最集中的地区和生态变化最为敏感的地区。
Taking xinzhou city as the case , the paper analyzes the city ' s actual situation of water supply , available water sources and their amount , distribution and development . it also calculates the mid and long term needed water amount and insufficient water amount in the city . taking the natural , commercial and life material properties and environmental function of water sources into full consideration , taking the satisfaction of the needed amount of the city and the balance and the largest capacity of every water source as the prerequisite , the paper aims at the mid and long term water supply sources ( north water sources region , douluo water sources region , shuiquanwan water sources region ) and the lest spending on the investment and operation of the self - equipped wells ; through the determination of decision variables , a model of economic management for the city ' s water supply is established , witch carries out the mid and long te rm optimal operation of water supply for the city 本文以忻州市为例,分析了忻州市供水现状,可供水水源、水资源量、分布及开发利用情况,预测了中长期需水量和缺水量,充分考虑水资源的自然属性、生活资料属性、商品属性和环境因素功能,通过决策变量设置,在保证城市需水量、水资源平衡和各供水水源最大供水能力的前提下,以开采忻州市中长期供水水源(北水源地、豆罗水源地、水泉湾水源地)和自备井开采的投资和运行费用最低为目标,建立了城市供水水源优化调度经济管理模型,运用线性规划方法进行了城市中长期供水水源优化调配。