double-barrel carburetor

active receptor carry one's life in one's hand climb of rigid dislocation over obstacles computing environment dihydroxyphenylisatin east-south-east electronic translator five-screw pump interaction control lock-switch percutaneous transluminal balloon mitral valvulopl potentiometric titration method pure rubber hose QZ-2 six-piece system of classification tractor dozer transmissible credit twin fan water transportation enterprises