单项选择题
Air bubbles in a hydraulic governor can cause （）
A.sluggish response
B.speed droop variations
C.isochronous governing
D.sensitivity increase
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On a diesel engine equipped with an isochronous governor, if the “speed droop” control is reduced to the “zero” setting, the engine （）
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C.will stall upon application of load
D.speed will remain fairly constant despite load changes -
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