Which statements about creep forming is correct?

Which statements about creep forming is correct?
A.A workpiece is loaded against a die or tool for a specific time
B.The load is normally applied using pressure or vacuum at temp. around 600°C
C.The process results in predetermined shapes that required little or no machining
D.No
正确答案：A workpiece is loaded against a die or tool for a specific time；The process results in predetermined shapes that required little or no machining