You can handle this with numeric types; for instance, executable is 1, directory is 2, and special is 3.

可以使用数字类型来处理它；例如，可执行文件为1，目录为2，特殊为3。

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Use a password of at least 6 characters, and ensure that it contains some numeric and special characters (for example, c0113g3).

使用至少 6 个字符的密码，并且确保包含一些数字和特殊字符（比如，c0113g3）。

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DEM has been one of basic contents of National Special Data Infrastructure (NSDI) in various countries and integrated by Numeric Spatial Data Frame (NGDF) to produce in large scale.

DEM已成为世界各国空间数据基础设施(NSDI)的基本内容之一，被纳入数字化空间数据框架(NGDF)进行规模化生产。

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