选词填空 An irrevocable L/C A confirmed L/C D/P at sight D/P after sight 1 _____________________ : By this method, we take “60 days after date of the draft”. For example, the buyer has to pay the money on the 60th day after the date of the draft. 2 _____________________ : By this method, the seller issues a sight draft. The collecting bank presents the sight draft to the buyer. The buyer pays the money at once, and then he can get the shipping documents. 3 ______________________ is confirmed by another bank on behalf of the opening bank. 4 ______________________ cannot be amended or withdrawn by either the opening bank or the buyer within the credit validity without the consent of the seller.