请问D/P at sight require.的意思是?

请问D/P at sight require.的意思是? 请问 付款方面,20% L/C AT SIGHT,75% D/P AT SIGHT 怎么翻译, 请问有谁做过D/P at sight 的付款方式啊?现在有个客户要求30%T/T ,70%D/P at sight ,我 D/P at sight与T/T与T/C的利与弊是什么? at the sight of的意思是什么 Irr.L/C at sight的意思? D/P at 90 days after sight 和D/A at 90 days after sight 有何区别, D/P AT 30 DAYS AFTER SIGHT 和D/A AT 30 DAYS AFTER SIGHT有何区别,各 大哥大姐~D/P AT 30 DAYS AFTER SIGHT和D/A AT 30 DAYS AFTER SIGHT有何 D/P at sight 的付款方式,托收行要承担哪些义务,代收行要承担哪些义务? D/P after sight与D/A after sight的区别是什么啊? catch sight of 和 at the sight of 是同一个意思么