查询词典 erosion

The mechanism of soil erosion at different degrees was expounded,which was caused by different cutting methods, skidding method s,and cutover land cleaning methods in forest operation techniques.

本文分析森林作业技术中不同采伐方式、集材方式和迹地清理方式造成的不同程度水土流失的机制，提出防止因森林作业而导致水土流失措施：合理选择采伐方式，避免大强度采伐，选择对土壤破坏小的集材方式，使剩余物对雨水保持截持作用的迹地清理方式。

Piercement of drilling pump cold cyclinder is a serious problem existed in field application.Piercement is caused by cavitation erosion.

钻井泵冷缸刺漏是钻井泵在现场使用中存在的一个较严重的问题。

So preventing cold cyclinder from piercement should start from preventing cold cyclinder from cavitation erosion.

刺漏是由气蚀引起的，因此预防冷缸刺漏应从预防冷缸气蚀入手。

Cavitation erosion is related to bubbles.Bubbles pop out from drilling fluid in vacuum conditiun and form air mass against cyclinder well.For low resistance to pressure,air mass happen explosion when compressed,making cyclinder wall cavitated.

气蚀发生的条件与气泡密切相关，气泡在真空时从钻井液中溢出形成气团，并紧靠缸壁；气团在压缩时因承压能力低而产生爆炸，从而引起缸壁产生气蚀作用。

Based on the analysis of the mutual action between CO2 fluids and sandstone, it is found that the higher content of dawsonite is the main cause for poorer reservoir properties, and the dawsonite is formed later than other authigenic minerals and no erosion occurres after the pores filling, which are the basic factors resulting in poor reservoir properties.

分析CO2流体与砂岩的相互作用发现，片钠铝石含量较高是储层物性变差的直接原因，而片钠铝石生长时间晚于其它自生矿物且在充填孔隙后没有发生溶蚀是储层物性变差的根本原因。

Rash, pustular psoriasis may also have changed. X ray showed that some patients with rheumatoid arthritis joint changes and the same may have a partial decalcification bone, joint cavity narrow, there are varying degrees of joint erosion and soft tissue swelling.

皮疹也可有脓疱型牛皮癣的改变。X线显示，部分病人关节的变化和类风湿型关节炎相同，骨质可有局部的脱钙，关节腔狭窄，有不同程度的关节侵蚀与软组织肿胀。

Here we present the erosion condition of Steam Ejector during the decarbonization process and provide the corresponding restoration methodology.

介绍了脱碳流程中蒸汽喷射器的腐蚀情况及修复措施，并对腐蚀的机理作一探讨。

Water depth data ; computer processing ; erosion ; accumulation ; stercogram ; section ; declivity

水深数据；计算机处理；冲刷；淤积；立体图；剖面图；坡度图

The main cause of soil erosion is deforestation .

水土流失的主要原因是滥伐森林。

First,erosion resulting from excessive deforestation in the upper reaches of the r ...

第一，过度砍伐引起的河流上游的侵蚀，第二，严重的泥沙淤积抬高了主干道的河床。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。