dutyfreeadj.免税的adv.免税地
dutyn.义务;职责;责任;税;关税
duty cycle ratio占空比
duty cycle curve负载周期曲线
duty-free shop免税店
duty-free zone免税区
duty of diligent勤勉义务
duty to disclose信息披露
duty record book值班登记簿
Duty is remitted义务免除
duty free-zone免税地带
duty-free slip免税单