How is difference between EXTRUDE and PRESSPULL command in Autocad 3D

How is difference between EXTRUDE and PRESSPULL command in Autocad 3D.

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We can receive to carry out the drawings, calculations & Analysis for Vessel (Ship, Jack-up, Liftboat,…) and others offshore project.
For example:
Local structure strength analysis.
Global Hull Analysis
Freeboard calculation
Tonnage calculation
Intact & damage stability
Hydrostatic stable for vessel
Production drawing
Tank Sounding table
P&ID drawing
….
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