The main hydrogeological problems in Yuncheng basin are as follows. 1. To solve the regional groundwater drawdown cone problem, the quantity of groundwater resources must be investigated.

We calculated the surface subsidence, horizontal displacement, incline, and current curvature using the groundwater drawdown, conical depression influence radius of water cone and ground property.

根据地下水降深、降落漏斗影响半径、岩土工程地质性质，计算降水引发的地表沉降值、水平移动、倾斜、曲率现状值。

Underground Substation at Shanghai Remin Square was used as example, the optimization method applied to groundwater drawdown project for deep excavation ( DGWE) is studied.

本文以上海市人民广场地下变电站深基坑降水工程为例，讨论最优化法在深基坑降水工程中的应用。

Characteristic of Groundwater Drawdown and its Sustainable Development Countermeasure in Minqin Basin

民勤盆地地下水水位下降特征与可持续利用评价

To Determine Critical Water Level by Correlation between Land Subsidence and Groundwater Drawdown

根据地面沉降与地下水头的关系求地面沉降临界水位

Analysis on Meteorological Contributing Factors of Groundwater Drawdown Funnel in Langfang

廊坊市地下水位下降漏斗的气象成因分析

The main pollution reasons include the species hydrogeologic conditions, sewage irrigation, landfill of municipal refuse, and regional groundwater drawdown.

最主要的污染原因有：独特的水文地质条件，污灌，砂石坑垃圾回填，及区域地下水位下降。

The results show that when increasing the wheel load, drawbar pull accordingly increase and the tractive efficiency show downtrend before uptrend.

随着轮齿高度的增加，挂钩牵引力会随之增大，车轮的最大牵引效率有所降低；

The maximum drawbar pull in earthmoving machinery is the one of main parameters in design and it is limited by the drive slip.

最大牵引力是土方机械设计的主要参数之一，其取决于对土方机械行走系统的滑转率的控制。

When the drive slip is less than 0.05~ 0.30 percent, the drawbar pull in earth-moving machinery is good.

滑转率在0.05～0.30时，可使土方机械的驱动力达到最佳。

Drawbar pull-weight ratio

牵引杆拉力-重量比

The predicting formula of the drawbar pull of driven wheels running on the sand is obtained by model test.

通过模拟试验，得出了驱动轮在砂地上行驶时的挂钩牵引力预测公式。

The increase of lug height may result in the improvement of drawbar pull and driving efficiency.

增加齿高可以提高牵引力和驱动效率。

TESTING Experiment and Analysis on Tractor Drawbar Pull Characteristics

拖拉机牵引性能试验分析

Trailer with adjustable drawbar height

牵引杆高度可调式挂车

The suitcase body is provided with an adjustable drawbar and roller wheels.

箱体设置有可调拉杆和滚轮。

Achievements, Problems and Prospects in China's Water Conservancy Construction

中国水利建设的成就问题和展望

Water Conservancy Construction and Ecological Environment Protection for Sustainable Development

水利工程建设与保护生态环境可持续发展

Chapter IV, this chapter is mainly analyzed on water conservancy construction and land development.

第四章主要论述宁夏平原的水利建设与土地垦殖情况。

Chinese traditional water conservancy construction and development is decided has specific geographical conditions.

在环境史视野下研究发现，中国传统农田水利建设与发展是有特定的地理环境决定的。

On farmland construction of water conservancy works in China

略论我国农田水利基本建设