Which of the following devices is a common basic element with nearly all mechanical governors?A.Power pistonB.Control rackC.Weights acted on by centrifugal forceD.Isochronous（同步的）droop spring
Which of the following devices is a common basic element with nearly all mechanical governors?
A.Power piston
B.Control rack
C.Weights acted on by centrifugal force
D.Isochronous（同步的）droop spring
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