Accordingtodocumentarycredit,the____,onreceiptofletterofcredit,willhavetoprepareshipmentofthecontractgoodswithinthedeliverydate.

UnderFCAterm，ifthechosenplaceofdeliveryoccursattheseller’spremises，thesellerisnotresponsibleforling.

Inmostsupplychains,customerrequirementsaretransmittedintheformof（）

Whenthegoodsareshippedonboard,relevantcommentsoncargoconditionsshouldappearin（）.

简述国际贸易术语的作用。