Silk Road; tourist cities; gradient development.
西北丝绸之路区；旅游城市；梯度开发。
The impact of starting pressure gradient must be considered due to existence of starting pressure gradient and recovery difficulty during the development of low permeability oil reservoirs.
低渗透油田由于存在启动压力梯度，开采难度很大，因此，在低渗透油田开发时必须考虑启动压力梯度的影响。
The variation of flow velocity in high gradient reveals the paroxysmal characteristics of the development of rill.
大坡度的水流速度变化揭示了细沟发育具有突发性特征。
The influences of threshold pressure gradient, vertical heterogeneity, subzone thickness and areal sand thickness distribution on development of low-permeability heterogeneous reservoirs are analyzed.
根据低渗透非均质油藏的特点，分析了启动压力梯度、纵向非均质性、小层厚度和平面砂体厚度展布对该类油藏开发的影响。
The application of gravity gradient in the attitude control system of mini-satellites provides an advantaged tool for the development and research of the miniaturization of satellites.
分析比较了目前卫星采用姿控的原理和方法，应用现代控制理论分析了重力梯度卫星姿控系统的性。
The application of gravity gradient in the attitude control system of mini-satellites provides an advantaged tool for the development and research of the miniaturization of satellites.
分析比较了目前卫星采用姿控的原理和方法，应用现代控制理论分析了重力梯度卫星姿控系统的性。
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