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Which one of the following frequency meter is suitable for measuring radio frequency? 

 (a) Vibrating reed frequency meter (b) Weston frequency meter (c) Electrical resonance frequency meter (d) Heterodyne frequency meter 

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Which one of the following frequency meter is suitable for measuring radio frequency? 

 (a) Vibrating reed frequency meter (b) Weston frequency meter (c) Electrical resonance frequency meter (d) Heterodyne frequency meter 

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