An oxide layer on aluminum is ____, while on iron it is ____.
A. black, reddish
B. reddish, gray
C. white, black
D. white, reddish
Answer: A
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No-hub fittings are typically attached to cast iron pipe with _____.
a. threaded joints b. flange adhesives c. banded clamps d. sweated joints
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Solder used for waterlines can only contain small amounts of lead
Indicate whether the statement is true or false.
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Swine producers are increasingly using _________ lines, which are derived by crossing breeds
a. Purebred c. Artificial b. Inbred d. Synthetic
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In the feedback system in Figure E-4 
What range of real values of K makes this system stable?
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