填空题

A—intermediate trade B—mutual exchange of needed products
C—export surplus D—visible trade
E—multilateral trade F—import and export trade
G—trade route H—special export
I—promoting the sale of products J—indirect export
K—to earn foreign exchange L—trade expense
M—trade account receivable N—trade returns
O—unilateral export P—trade terms
( )贸易回报 ( )互换所需