21．来料加工贸易中通常使用的信用证是(       )

A．对背信用证                                                B．循环信用证

C．对开信用证                                                D．预支信用证

22．罚金实质上就是(       )

A．订金                                                          B．违约金

C．预付货款                                                   D．索赔金额

23．下列不是我国出口结汇办法的是(       )

A．收妥结汇                                                   B．票汇

C．押汇                                                          D．定期结汇

24．在国际贸易中采用的寄售方式属于(       )

A．凭说明买卖                                                B．凭等级买卖

C．凭规格买卖                                                D．凭实物买卖

25．补偿贸易最基本的做法是(       )

A．直接产品补偿                                            B．其他产品补偿

C．劳务补偿                             & nbsp;                     D．综合补偿