tough roof 中文意思是什麼
tough roof
解釋
堅固頂板-
To solve the problem of the relative difficulty in roof caving in highly tough top - coal, it is very important to study the mechanism of difficult caving of highly tough top coal
摘要為了解決高韌性頂煤的冒放性較差的問題，對其難冒性機理進行研究是非常重要的。 -
Through theoretical analyses in the article, the highly tough top - coal deflection before destroying is in inverse proportion to elastic mould, in direct proportion to tensile strength, and the conclusion that bigger deflection roof can ' t sufficiently transmit the compressible support to top - coal is drawn
通過理論分析，獲得了高韌性煤層煤體在破壞前的撓度與彈性模量成反比，與抗拉強度成正比的關系，並得出撓度較大的頂板不能很好把支承壓力傳遞給頂煤的結論。 -
In swallowing, they close their eyelids, press down with their extremely tough eyeballs, and lower the roof of their mouth against their tongue, forcing the food down and into their stomach
它們在吞咽事物時閉上眼皮，用其十分結實的眼球往下壓，同時上顎向下壓迫舌頭，從而將食物往下擠入胃中。
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