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The coefficient of fluctuation of speed is __________ of maximum fluctuation of speed and the mean speed.

A. Sum

B. Difference

C. Product

D. Ratio

Please do not use chat terms. Example: avoid using "grt" instead of "great".

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  15. When a point moves along a straight line, its acceleration will have
  16. If the radius of gyration of a compound pendulum about an axis through e.g. is more, then its frequency…
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  18. The flank of the tooth is the surface of the tooth __________ the pitch surface.
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  24. The example of higher pair is
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