【机械工程】主送料活门，灌装用秤量机中控制来自漏斗，滑槽，贮器的滴送物料

simple main effect

arterial railway【铁路】;main railway【铁路】

main pulley

main part of root and short rhizome

main flux

main vein

main control room

main feed flap for dribble-feed control from silos for filling balances