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I followed several tutorial to create a nurbs curve, and duplicate it in edit mode. Of course I pressed A key to select all points and F key to create surface. But there was no surface be created, a start point of one curve and an end point of another point were connected instead. Ready to press F key Final result after pressing F key

Is there anybody get any idea about this case?

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You simply need to use one of the Nurbs Surface types. Add > Surface > Nurbs Curve
add menu

A Curve, whether a nurbs or bezier is only a stroke. It can not have volume, it is only ever a line.
A Surface is a full 3D solid that can have volume. All the expected commands will work: Fill F, Extrude E etc.

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