【单选题】Using vi, you want to save changes to the file myfile with :w!, but vi complains it cannot write to the file. Therefore, you want to check the write permissions on the file. To do this without leaving...
【简答题】VI. Writing (25 points) Directions: For this part, you are supposed to write a letter of refasal in English in 100-120 words based on the following situation. Remember to write it clearly. 61. 你(Li Yu...