  Nuclear Fermi momentum is a basic property of a nucleus where many nucleons
dwell. However, in experiments only the nuclear Fermi momenta of just a few
nuclei are measured using the electron quasielastic scattering off the nucleus
so far. Particularly, we still do not know experimentally the Fermi momentum of
the lightest nucleon composite -- the deuteron. In this paper, we apply a
gaussian distribution to describe the quasielastic peak in the cross section of
electron-nucleus scattering. By performing the least-square fits to the recent
CLAS data in the narrow quasielastic region, we obtain the nuclear Fermi
momenta of $^{2}$H, $^{27}$Al and $^{56}$Fe, which are $116\pm4$ MeV/c,
$237\pm13$ MeV/c, and $241\pm13$ MeV/c respectively. The extracted nuclear
Fermi momenta are compared to the simple calculations using Fermi gas model,
and the consistences are found.
