单项选择题
Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）
A.double bottom fuel oil tank temperature
B.heater supply steam flow
C.pressure of the fuel supplied to the burners
D.attemperator steam flow in the heater discharge circuit
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The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated（）
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