agricultural labour force
labour force’s transfer
planning urban-rural labour force as a whole
rural surplus labour force
transfer of labour force
action force and reaction force
applied electromotive force {= applied EMF}; impressed electromotive force
Attractive Force and Spring Force Characteristics
Centripetal force and tangential force
equation of capillary force and buoyant force
force of-whist force stability
force-drive (or force-closed) cam mechanism