单选题The ash content of a fuel oil is significant to the operating engineer because it （）Ais an indication of the amount of noncombustible material present in the oilBindicates the quantity of energy released by burning a unit amount of the fuelCis useful for determining proper atomization temperaturesDreflects the overall thermal efficiency of the fuel oil service system
单选题
The ash content of a fuel oil is significant to the operating engineer because it （）
A
is an indication of the amount of noncombustible material present in the oil
B
indicates the quantity of energy released by burning a unit amount of the fuel
C
is useful for determining proper atomization temperatures
D
reflects the overall thermal efficiency of the fuel oil service system
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