  Results of the investigation of fluctuation phenomena in bulk type-II
superconductors obtained in 1980 - 1984 years are compared with the analogous
results obtained at the investigation of high-Tc superconductors (HTSC). It is
shown the latter repeat in the main the results obtained before the HTSC
discovery. It was discovered in 1981 year that a sharp change of resistive
properties is observed below the second critical field, at H_{c4} < H_{c2}, in
high quality samples of type-II superconductors. The same was repeated at
investigation of high quality HTSC samples and was interpreted as vortex
lattice melting. The difference of the (H_{c2} - H_{c4}) values for low- and
high-Tc superconductors corresponds with the scaling law obtained in the lowest
Landau level approximation. The linear approximation region above H_{c2}, the
critical region and the Abrikosov state are considered. It is emphasized that
the rigorous Ami-Maki theory should be used for description of paraconductivity
in HTSC and "dirty" conventional superconductors. The approximation
dependencies obtained from popular Aslamasov-Larkin, Hikami-Larkin and
Lawrence-Doniac works do not have a validity region in these superconductors
with wide critical region.
