三通阀

three-phase AC asynchronous motor

three blow two die cold header

three direct links (mail, air and shipping services and trade) and bilateral exchanges

three-phase seven-wire system

three-pole double-throw knife switch

iterative three-stage least squares estimate【数】;iterative three-stage LSE【数】

three-phase squirrel-cage two-pole asynchronous motor

Houwink's three yield values