[Solved] Masks, which are used to confine the jet stream location on work piece are made of, which type of materials?

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Q.	Masks, which are used to confine the jet stream location on work piece are made of, which type of materials?
A.	copper
B.	glass
C.	rubber
D.	all of the mentioned
Answer» D. all of the mentioned
Explanation: masks can be made of any of the above-mentioned materials.

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