说明:双击或选中下面任意单词,将显示该词的音标、读音、翻译等;选中中文或多个词,将显示翻译。
您的位置:首页 -> 词典 -> 含宝石砾层<地>
1)  illam
含宝石砾层<地>
2)  gem gravels
宝石砾层<地>
3)  gravel formation
含砾地层
4)  gravel strata
卵砾石地层
1.
By the analysis of present drilling ways,and according to the characteristics of gravel strata,application feasibility is put forward for DTH hammer concentric simultaneous casing drilling tool in gravel strata,and analysis are made on the structure principle and characteristic of drilling tool.
卵砾石地层是钻探工程中常见的一种典型的不稳定地层。
2.
Through applying downhole hammer concentric simultaneous casing drilling method,the difficulties that drill in gravel strata are solved out fundamentally,the authors consider downhole hammer concentric simultaneous casing drilling is an effective way for gravel beds in combination with a case of rock-soil engineering survey in Duyun Cit
卵砾石地层是钻探工程中常见的一种典型的难钻进不稳定地层。
5)  gravel stratum
卵砾石地层
1.
Abatract The paper firstly introduces the designing principle of a new-type alloy-diamond bit for the gravel stratum, secondlyexplains briefly the mechanism of matrix composition for the new-type bit.
本文首先介绍一种用于卵砾石地层钻进的新型针状硬质合金钻头的设计原理,而后简要说明其胎体配方组成机理。
2.
Drilling in gravel stratum is one of present difficulties in drilling area with low drilling speed,short service life of bit and high drilling cost.
卵砾石地层钻进是钻探的难题之一,不仅钻进速度低,钻头的使用寿命短,而且钻探成本高。
6)  sand-gravel strata
砂砾石地层
1.
High-pressure rotary jet-grouting for anti-seepage in sand-gravel strata
高压旋喷灌浆防渗技术在砂砾石地层中的应用
补充资料:含铋层状结构
分子式:
CAS号:

性质:由两个(Bi2O2)2+层和夹在其间的n个钙钛矿层所构成(n=1,2,3…)。此类结构的通式为:(Bi2O2)2+(An-1BnO3n+1)2-,式中A为铋(Bi)、铅(Pb)、钡(Ba)、锶(Sr)、钙(Ca)、钠(Na)、钾(K)等;B为钛(Ti)、铌(Nb)、钨(W)、钼(Mo)、铁(Fe)、钴(Co)、铬(Cr)等;n=1,2,3…。如Bi3TiNbO9,Bi4Ti3O12,Bi4PbTiO9等都具有层状结构晶体,其中许多晶体具有优良的电性能,在电子陶瓷中已得到应用。

说明:补充资料仅用于学习参考,请勿用于其它任何用途。
参考词条