gravell wall

ThesePaleolithictoolsareidentifiedin thegraveltooltraditionin SouthChina,anddated to thelatephaseof theEarlyPaleolithicAgeto theMiddlePaleolithicAge.

本文对沅水下游17个地点的旧石器的地理埋藏、自然环境、文化面貌、时代特征进行了分析,并与相邻的澧水文化类群和氵舞水文化类群进行了比较,认为这批旧石器的时代为旧石器时代早期偏晚至旧石器时代中期,属华南砾石石器传统,并指出沅水下游旧石器属于澧水文化类群,兼具澧水、氵舞水两大文化类群之间的某些过渡性特征。

permeable consolidated gravel pack

可渗透胶结砾石充填体

Material Dissolution and Engineering Application of Cement Sand and Gravel (CSG) Dam;

胶凝砂砾石坝材料的渗透溶蚀研究及工程应用

surface gravel pack

地面倾倒式砾石充填

GP shear-out safety joint

砾石充填剪切安全接头

offshore gravel packing operation

海洋油井砾石充填作业

down-ward progression of gravel

砾石逐渐向下充填推进

nondamaging gravel packing fluid

不污染的砾石充填液

gravel flow packed liner completio

循环砾石充填衬管完井

over-the-top gravel packing too

皮碗式砾石充填工具

2-pot gravel compaction ficompaction filter unit

双罐砾石充填过滤装置

through-tubing squeeze gravel packing

过油管砾石挤压充填

multiple zone open hole gravel pack

多层裸眼井砾石充填

outside perforation packing

射孔孔眼外砾石充填

positive injection gravel compaction metering unit

砾石注入充填计量装置

double pot gravel pack mixing unit

砾石充填双罐混砂装置

gravel pack perforated extension

砾石充填带眼加长短节

post gravel pack acid job

砾石充填后的酸化作业

gravel pack straddle too

砾石充填对口皮碗工具