dense subset是什么意思

用法例句

Let T be any countable dense subset of the irrational, it can be arranged that T be an orbit of _η and that every e≠∈_η move every point in T.

自由群Fη(1<η≤ 0)在有理数集Q上有一个高可迁表示,若T是无理数集上的一个任意可数稠[密]子集,则可使得T是^Fη的一个轨道且对任意e≠ w^∈^Fη变换T中的每一个点。

All Quarter-stratifiable spaces have a σ-closed-discrete dense subset if this space is second category and paracompact.

对第二纲的仿紧Quarter可层化空间进行了研究,证明了这类空间含有σ闭离散的稠[密]子集。

Study anf analyze the equipment corrosion of normal and diminished pressure installation used to process thick oil of Kelamayi Petroleum Chemical Plant;

稠油加工用常减压装置设备腐蚀失效分析研究

Study on subsurface-flow wetland system for treating thick oil produced water;

人工潜流湿地处理稠油采出水的实验研究

Because T2 spectra of thick oil are shorter and can rich the range of bound fluids, nuclear magnetic resonance logging in thick oil zones appears abnormally high bound water saturation and low permeability.

由于稠油有较短的T2谱,常常达到束缚流体的范围,所以对于稠油层,核磁共振测井表现为异常高的束缚水饱和度和很低的核磁渗透率,并且核磁渗透率随地层稠油饱和度的降低而增加,束缚水饱和度随地层稠油饱和度的降低而降低。

Apparent viscosity of water-in-heavy crude oil emulsion;

稠油包水乳状液的表观黏度

Analysis of the gray correlation entropy of viscosity to chemical components in heavy crude oil dispersion system;

稠油分散体系中黏度与化学组成的灰熵关系分析

Analysis of grey correlation entropy about the chemical composition influencing viscosity of heavy crude oil;

影响稠油粘度的化学组成灰熵分析