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並前往https://pdg.lbl.gov/1998/consrpp.pdf

1. PHYSICAL CONSTANTS - Particle Data Group

improved values for a number of constants, including the ... h. Planck constant. Value: 6.626 075 5(40)×10. −34 J s. Uncert. (ppm): 0.60. ~ ≡ h/2π.

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