根据《联合国国际货物销售合同公约》的规定，发盘不得撤销的情形有（）
Themarinecargoinsurancepremiumratesmayvarydependingonfactorssuchas____.
WhichofthefollowingdescriptionsaretrueaboutNVOCC_____?
TheAirWaybillisthemostimportantdocumentinaircargotransportation.Itservesas（）.
GeneralCargoRatesarenormallyhigherthanSpecificCommodityRatesinaircargotransportation.
