单项选择题
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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A.point of opening
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Which of the listed devices could be used as a ring groove tool during preparation for the installation of new rings?（）
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单项选择题
The main source of fuel injection system malfunctions is （）
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