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The comparison is made on the seepages of methane in coalbed core, sandstone core and coal powder core. 研究表明,煤层试样的渗透率受有效覆压的影响很大,其应力敏感性程度超过砂岩岩样。
The displacement experiments were made by using artificial core, natural outcrop sandstone core,natural sandstone core in oil field and simulated oil. 使用人造岩心、天然露头砂岩岩心,天然油田砂岩岩心及模拟油进行了驱替实验。
artificial homogeneous sandstone cores 人造均质砂岩岩心
The hard core in the party make all the decisions. 这个党的核心成员决定一切。
This concept is at the very core of her theory. 这个概念是她理论的核心。
He was a military man to the core. 他是个地地道道的军人。
Let's get to the core of the argument. 咱们进入实质性的辩论吧。
The core of our appeal is freedom of speech. 我们的要求的核心是言论自由。
The earth has a core and a mantle around it. 地球的中心是地核，地核的周围是地幔。
He ate the plum, and threw the core away. 他吃掉了李子，并扔掉了果核。
Let's get to the core of the matter. 让我们看看事情的核心。
Each student studies four core subjects. 每个学生学习四门基础课。
He is really rotten to the core. 他真是坏透了。
Roll deposits cut across sandstone bedding. 卷型矿床切穿砂岩的层理。
It took a long time to get to the core of the affair. 花了很长时间才抓住这件事的要害。
Sand was deposited which hardened into sandstone. 沙经沉积固结形成沙岩。
The sandstone and shale units are of the same age. 砂岩和页岩单元是同时的。
The sandstone shows a more persistent oscillation. 砂岩表示一个更为持久的扰动。
This channel is filled with cross-bedded sandstone. 该河边充填着具交错层理的砂岩。
These sandstone bodies form elongate lenses. 这些砂岩体形成伸长的透镜体。