Extended type tubes used with oil heaters are tubes
a) which have been expanded
b) which have extensions attached
c) with fins on their outer surfaces
d) of varying lengths
e) that reach beyond the top drum
Answer: C
Extended type tubes used with oil heaters are tubes
a) which have been expanded
b) which have extensions attached
c) with fins on their outer surfaces
d) of varying lengths
e) that reach beyond the top drum
Answer: C