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

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？

2·Are the expressions of sight draft, time draft, usance draft and letter of credit adequate terms to express the different methods of payment?

即期汇票，定期汇票，远期汇票和信用证这些术语，足以表现各种不同的付款方式吗？

3·The Buyer provides within 3 working days a Non-Operative, Irrevocable, Non-transferable Usance 90-days After Sight DLC (Documentary Letter of Credit) for the Seller's bank approval.

买方银行需在3天工作日内开出不可辙消，不可转让且不可操作的90天远期跟单见票信用证给卖方银行确认。