In Great Britain special per- mission is required to introduce internal combustion engines into mines by Section 58 of the Coal Act, 1911, which prohibits the use of these engines in w1derground workings without permission. Air Survey THE Air Survey Conunittee grew from a suggestion of the ...
This product is used in mines or coal miners mobile appliances and various extraction machinery equipment, conductor long-term working temperature, not exceed 65 °C products have good flame-retardant properties. 翻译结果5复制译文编辑译文朗读译文返回顶部 ...
For example, the elevation of EPU levels in the 1930s is dramatic in the US but modest in the UK, which experienced a less severe output fall during the Great Depression. World Wars I and II are more prominent in the UK EPU series. Gulf Wars I and II are associated with sharp EPU ...