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单选题
Heavy fuel oils generally have an upper average ash content of 0~1% by weight.Which of the following conditions could be expected if the ash content increase above this amount?（）
A
Glazing of the cylinder liners
B
Increase valve wear
C
Excessive oil pumping
D
Increase fuel consumption
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单选题What color exhaust will be exhibited when a slow speed two-stroke/cycle main propulsion diesel engine, designed to operate on light and heavy fuel oil, is operated on insufficiently preheated heavy fuel oil?（）A
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单选题The ash content of a fuel oil is significant to the operating engineer because it （）A
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flattening of the bowl neoprene O-ringsB
operation within the explosive rang of the fuelC
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考题
单选题When restarting a heavy fuel diesel engine that has been stopped for some time, the engine should（）A
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考题
单选题（） fuel oils （） lubricating oils require treatment before passing to the engine.A
Both；andB
Neither；norC
Either；orD
Both；or
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