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

[crobinson2013]

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

Question 2

Which type of copper tubing has the same dimensions as Type ACR?
 
  a. Type J
  b. Type K
  c. Type L
  d. Type M

[wuly]

Answer to Question 1

c

Answer to Question 2

c

[crobinson2013]

Thanks for the timely response, appreciate it

[xiazhe]

Excellent