[Gmsh] how to define physical surface

[王学敏]

Dear gmsh user,
I got geometry from solidworks, and it is STEP file. I can import it to
gmsh, but when I change it to geo file. I can not get mesh inside the graph
and I don't know how to define physical surface. Attachment is step
file. Thank you for your help.
Best regards,
Xuemin
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