词汇	lock head
释义	lock head 船闸闸首,闸首
随便看	production possibilities set production possibility production possibility curve production-possibility curve production possibility curveppc production possibility frontier production-possibility frontier production-possibility locus production potential production potentiality production potentials production power production practical training production practice production practice bases production practice bases outside school production practice mode Production practice of knitted bird eye fabric production practice, oil production technology Production Practice on All-Cotton Sateen production practices production pratice production precision production prediction productionpreparation