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A governor is said to be isochronous when

[A].	The equilibrium ball radii is constant for a given speed	[B].	For each speed within the working range the ball weights occupy a definite specific position
[C].	There is only one radius of the governor weights for each equilibrium sped	[D].	There is only one equibilbrium speed which is constant for all radii of rotation of the bells within the working range
[E].	None of the above

Answer: Option D