单项选择题
One result of operating a diesel engine at light load with excessively low cooling water temperature is a/an （）
A.decrease in ignition lag
B.increase in fuel economy
C.reduction in lube oil viscosity
D.increase in cylinder misfiring
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The plunger in a jerk pump is rotated until the release port is uncoveredIf the port remains uncovered all of the time, which of the listed operations will occur?（）
A.No fuel will be delivered
B.The maximum effective stroke will be attained
C.The fuel delivered to the cylinder will be excessive
D.The injection nozzle will overheat and carbonize -
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If the compensating needle valve of a hydraulic governor is opened more than necessary the governor will （）
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The double bottom in a vessel is a space comprised of （）
A.plating forming the engine room tank top
B.doubler plating installed over the flat keel plate
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