单项选择题
Proper filtering and straining of fuel oil is important because the （）.
A.fuel oil pump will over-speed if dirt is not removed
B.fuel oil transfer pumps cannot tolerate small amounts of dirt in the oil
C.fuel injectors may be damaged by foreign particles in the fuel oil
D.dirty fuel will clog the intake air filter
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A.low lube oil temperature
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The minimum speed an engine must attain before ignition can occur depends upon （）.
A.the type and size of the engine
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