Solved
About perpendicular projection (sketch)
Q3:XZ plane is my sketch plane, How to get the“perpendicular projection point” G of point K ? I can't do that by the snap tool or project tool. (the "S" shape curve is drawn in the ZY sketch plane )

Q3:XZ plane is my sketch plane, How to get the“perpendicular projection point” G of point K ? I can't do that by the snap tool or project tool. (the "S" shape curve is drawn in the ZY sketch plane )

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