该文在《岩石力学与工程学报》第9卷第2期刊出后,有读者提出疑问。经作者重新检查,发现144页第7行内“2α=90°-arctgμ”一式有误,应改为2α=90°+arctgμ。改正后影响到表2中2α、σ_n、[τ]和稳定性这四列结果,现更正如下:
A MESSAGE TO GARCIA by Elbert Hubbard 1899 In all this Cuban business there is one man stands out on the horizon of my memory like Mars at perihelion. When war broke out between Spain & the United States, it was very necessary to communicate quickly with the leader of the Insurgents. Garcia was somewhere in the mountain vastness of Cuba - no one knew where. No mail nor telegraph message coul