Which of the following devices is a common basic element with nearly all mechanical governors?（）<br>A:Power piston<br>B:Control rack<br>C:Weights acted on by centrifugal force<br>D:Isochronous 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 droop spring

出自：海船船员证

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