By means of travel cost method (TCM), the recreation value of the forest parks on the north slope of Qinling Mountains is evaluated in the paper.
基于意愿支付假设，在广泛调查的基础上，采用旅行费用法（TCM）对秦岭北坡森林公园的游憩价值进行了测评。
Using typical sampling method, the paper studies the composition and important value of plant species in subalpine spruce fir forest on Northern Slope of Changbai Mts.
采用典型抽样方法，对长白山北坡不同海拔高度带云冷杉林的植物种类组成及重要值进行了初步研究。
A new method for precursory information extraction, i. e. slope difference information method is proposed in the paper for the daily mean value precursory data sequence.
针对日均值前兆数据序列，提出一种新的前兆信息提取方法，即斜率差信息法。
The methods of measuring the biological value of feed phosphorus including balance experiment, slope rate method, tri - index method, in vitro solubility and in vitro dialyse methods were reviewed.
本文就目前关于饲料中磷的生物学效价评定的方法即平衡试验法、斜率比法、估测法、三项指标综合法、体外溶解度法、体外透析法作一综述。
White functions on the basis of equal-slope method are established, and value range of pollutants in white function is expanded with full use of information.
该法以等斜率方式构造白化函数，拓展了白化函数中污染物浓度的取值范围，有较高的信息利用率。
Then, a simple method for calculating cross slope gradient and superelevation value of any cross section within any superelevation transition zone is presented.
然后给出了任意超高过渡段内任意断面的超高横坡和超高值的简单计算公式。
According to the low value abnormality we have put forward the method of finding water in places of mountains, steep slope and hill where water table level is embebed deeply.
提出了在山高、坡陡、地下水位埋深较大的山丘地区找水，应以寻找低值异常为主的观点，并分析了形成低值异常的基本原因。
According to the low value abnormality we have put forward the method of finding water in places of mountains, steep slope and hill where water table level is embebed deeply.
提出了在山高、坡陡、地下水位埋深较大的山丘地区找水，应以寻找低值异常为主的观点，并分析了形成低值异常的基本原因。
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