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The 2D semimetal consisting of heavy holes and light electrons is studied.The consideration is based on assumption that electrons are quantized bymagnetic field while holes remain classical. We assume also that theinteraction between components is weak and the conversion between components isabsent. The kinetic equation for holes colliding with quantized electrons isutilized. It has been stated that the inter-component friction andcorresponding correction to the dissipative conductivity $\sigma_{xx}$ {\it donot vanish at zero temperature} due to degeneracy of the Landau levels. Thiscorrection arises when the Fermi level crosses the Landau level.  The limits of kinetic equation applicability were found. We also study thesituation of kinetic memory when particles repeatedly return to the points oftheir meeting.

Conductivity of 2D many-component electron gas, partially-quantized by magnetic field