16. What's the greatest benefit from 3D printing techniques? A. Prototypes are quickly produced. B. The technology is readily available. C. They use economical material with no safety concerns. O D. They can use the CAD model to program the part. 17. How much corner wear can you expect from a negative-polarity graphite electrode when machining aluminum? A. 40 to 70% B. 10 to 20% C. Less than 3% D. 30 to 40% 18. The term diesinker refers to what kind of process? A. Plasma cutting B. Wire EDM C. Ram EDM D. Water jet 19. The process forms solid objects by using a laser to fuse powdered metals. . A. LOM B. SGC C. ABS D. SLS 20. is a prototyping process used to produce a sand-casting pattern that's more accurately built than a conventional wooden one. . A. RPS B. LOM C. SLA D. SGC