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Engine_2014 : Steam Plants - 501/1951
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In a boiler, water flows downward in tubes furthest from the fires and flows upward in tubes nearest the fires because __________.
A) water is denser in the tubes farthest from the fires
B) water is less dense in the tubes farthest from the fires
C) tubes farthest from the fires have a greater diameter
D) tubes farthest from the fires have a smaller diameter
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