Learning progress -07

The third experiment three questions:

 

 

（1）

 

 

 

 

 

( 2 ) because the original deleted, and now need to add the file:

 

 

 success:

 

 

 

 

 （3）

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

（1）

 

 

 

( 2 ) because the original deleted, and now need to add the file:

 

success:

 

 

（3）