pilot trench是什么意思

用法例句

This can ameliorate the soil s characteristic of water conductivity by capillarity in drought areas,solve its problem of lacking of water,and recycle scrap fly ash.

提出了一种在干旱区植树造林新材料技术,通过在粘土中加入不同比例或是经过不同试剂改性的粉煤灰,以增加其比表面积,从而提高导水性能,改进干旱区土壤的毛细引水特性,解决该地区植树造林的水分问题;同时达到对废弃粉煤灰资源再利用的目的。

The height of water flowing fractured zone is 55 m by traditional esti- mation method,so that the water can not reach sand-gravel water-bearing bed.

覆岩主关键层位置距离开采煤层较近,是导致顶板导水裂隙高度偏高和顶板异常突水的根本原因。

Study on the characteristics of water-conducting in the coalfilelds of North China;

华北煤矿地下导水通道性质的研究

The desorption properties of coating material on coated water-release fibres,slow and controllable water-release rules and the combination properties of the coating were analysed by thermal multi-analyzer,stereoscan photogragh,optical microscope,microscopic image analyzer and moisture rapi.

本文对用于蓄水渗膜的导水纤维进行了研究。