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Question
The air entering air storage tanks may contain:
Answers
A.  Water and compressor oil.
B.  Frost.
C.  Gravel.
D.  Antifreeze.
Explanation
The air that enters air storage tanks in an air brake system usually contains a certain amount of water and compressor oil. Because accumulations of these materials can damage the braking system, tanks are equipped with drains to allow their removal.
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