Ny varavarana vy tsy misy afo dia mahatohitra ny fiantraikany, ny rafitra dia afaka manohitra ny fiantraikany maharitra nefa tsy mampihena ny fahombiazan’ny fisorohana ny afo, ary mahatohitra ny fiantraikan’ny afo hydrant. Ny varavarana vy tsy misy afo dia manana tahan’ny deformation ambany mandritra ny hafanana sy ny curvature ambany warpage aorian’ny hafanana.

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