  7
   ,        7;      .

:
-     <>,                  7.         .
-          7,        7,       .         . 
-          7,        7,    <Ctrl> + <7>  .         . 
-          7,       .
-          7,   <7>  .
-               ,       .          .    
-            2D  3D    <>   .               2D/3D  .   
-       <>    .