The cause of house crack determined by security coal pillar of village.
房屋裂缝是否由煤矿采煤引起，主要是看采空区是否进入村庄保安煤柱。
This paper offer the algebra ray method to preserve protective coal pillar.
本文采用代数射线法留设保护煤柱。
The instability and failure of strip coal pillar along strike is a typical nonlinear process.
走向条带煤柱的破坏失稳是典型的偏离平衡态的非线性过程。
Coal trade is the pillar industry of our country.
煤炭行业是我国的支柱产业。
The coal trade is a pillar industry of our country.
煤炭行业是我国的支柱产业。
The coal trade is a pillar industry of our country.
煤炭行业是我国的支柱产业。
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