Indesigningalogisticalsystem,adelicatebalancemustbemaintainedbetweentransportationcostand（）
D
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Accordingtodocumentarycredit,the____,onreceiptofletterofcredit,willhavetoprepareshipmentofthecontractgoodswithinthedeliverydate.
TheAirWaybillisthemostimportantdocumentinaircargotransportation.Itservesas（）.
Which of the following descriptions are true about NVOCC_____?