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Design and implementation of abstract data types of sea turtles Turtle, and as a basis for designing a presentation turtle drawing program. Basic requirements 〔〕 (1) set the basic operation of the type of sea turtles as: procedure StartTurtleGraphlcs (display mapping window, and the window to write my name on the machine number and the experiment Question. ) Procedure StartTurtle (enable mapping of sea turtles in the initial state. Drawing window is displayed, and sea turtles located in the window center ) (set state brush strokes, the glans toward 0 degrees (due east). )