D/P 的付款方式和30% deposit in advance, 70% balance against the copy B/L两种付款方式有什么区别?

D/P 的付款方式和30% deposit in advance, 70% balance against the copy B/L两种付款方式有什么区别?
D/P 的付款方式和30% deposit in advance, 70% balance against the copy B/L
两种付款方式有什么区别?

D/P 的付款方式和30% deposit in advance, 70% balance against the copy B/L两种付款方式有什么区别?
前者是D/P 付款交单
后者是TT
举个列子：
1.D/P付款 收到客人订单后就开始生产,出货,然后准备单据去银行,对方付款了,银行才将单据为他们.
2.TT (30% deposit in advance,70% balance against the copy B/L)
收到订金才开始生产,出货.在客人付款余款前才将BL寄给客人.
现在明白了吧?