判断SD卡是否已经“挂载”，“挂载的标识是”？（）A、Environment.MEDIA-MOUNTEDB、Environment.get External storage DirectoryC、Environment.EXTERNAL STORAGED、Environment.MEDIA-DIRECTORY
题目
判断SD卡是否已经“挂载”，“挂载的标识是”？（）
- A、Environment.MEDIA-MOUNTED
- B、Environment.get External storage Directory
- C、Environment.EXTERNAL STORAGE
- D、Environment.MEDIA-DIRECTORY
