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1 ns is defined as...

1 ns is defined as

A

10_9s of Kr-clock of 1650763.73 oscillations

B

10_9s of Kr-clock uf 652189.63 oscillations

C

10_9s of Cs-clock of 1650763.73 oscillations

D

10_9s of Cs-clock of 9192631770 oscillations

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