As you have known, all DOS commands are classified as either internal or external.

正如你们已经了解到的，全部DOS命令可归类为内部命令，或外部命令。

youdao

As you have known, all DOS commands are classified as either internal or external.

正如你们已经了解到的，全部DOS命令可归类为内部命令，或外部命令。

youdao