即期汇票，定期汇票，远期汇票和信用证等专用语是否足以表述各种不同的付款方式呢？

Are the expressions of sight draft time draft usance draft and letter of credit adequate terms to express the different methods of payment!

W：即期汇票、定期汇票、远期汇票和信用证这些术语足以表示不同的付款方式了吗？

W: Are the exprssions of sight draft, time draft , usance draft and letter of credit adequate terms to express the different methods of payment?