Hard-drawn copper tubing is harder than soft tubing because _____

a. it has been annealed
b. it has other metals combined with the copper
c. of the drawing process used to manufacture it
d. it has been through a special tempering process after forming


c

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Fill in the blank(s) with the appropriate word(s).

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Indicate whether the statement is true or false

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What will be an ideal response?

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