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4. Cancel and reback
(1) Cancel: click
the icon to cancel the previous step operation, and up to 10
steps of cancel can be supported at a time;
(2) reback: click
the icon to re-execute the canceled operation, with up to 10
steps of reback supported at a time.
5. Selection function
(1) click on
the selected option, interface by writing mode switching selection
mode, can drawing the interface handwriting, shape, and then move, delete, copy and
paste functions to insert the picture move, delete, copy and paste, rotate zoom function
operation;
