远程登录Telnet对话。
10. class MakeFile { 11. public static void main（String[] args） { 12. try { 13. File directory = new File（”d”）； 14. File file = new File（directory，”f”）； 15. if（!file.exists（）） { 16. file.createNewFile（）； 17. } 18. } catch （IOException e） { 19. e.printStackTrace 20. } 21. } 22. } The current directory does NOT contain a directory named “d.” Which three are true？（） [" Line 16 is never executed."," An exception is thrown at runtime."," Line 13 creates a File object named “d”."," Line 14 creates a File object named “f‟."," Line 13 creates a directory named “d” in the file system."," Line 16 creates a directory named “d” and a file “f” within it in the file system."," Line 14 creates a file named "f " inside of the directory named “d” in the file system."]
精进技术除了获得效益外，也是对于自己能力的充分认可
井下低压馈电线网上，必须装有（）. ["选择性动作的单相接地保护装置","检漏保护装置或有选择性的漏电保护装置","漏电闭锁"]
刚性挡土墙在填土压力作用下背离填土一侧移动，使墙后开始剪裂，土体下滑，则作用在墙上的水平压力称为（）。 ["静止土压力","被动土压力","主动土压力","水平推力"]
油罐进行明火修复前必须做哪些准备工作？
