bottom thickness

基本解釋

The safety of deep mining area bottom is given, and determine the roadway drivage of working face safe water and bottom water thickness of water-resisting layer security.
給出了深部采區(qū)底板的安全范圍，并確定了回采工作面安全水頭及掘進(jìn)巷道底板隔水層安全隔水厚度；
This paper puts forward conceptions of dangerous angle and bottom-thickness coefficient for the first time, gives out relation curves between them and makes analysis with actual examples.
首次提出了危險角度及底厚系數(shù)概念，并給出了它們之間的關(guān)系曲線。文末進(jìn)行了實例分析。
Reservoir homogeneity and bottom water thickness are mainly investigated, compared and studied in order to understand why the sand reservoirs in Pearl River Mouth Basin is with higher productivity.
對珠江口盆地砂巖油田高產(chǎn)能的原因，重點從儲集巖的均質(zhì)性和底水厚度兩個因素做了調(diào)查、對比和研究。