Which of the following statements are true about documentary credit_____?
A、documentarycreditmeanspaymentagainstdocumentinsteadofagainstgoodsABCD
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TheAirWaybillisthemostimportantdocumentinaircargotransportation.Itservesas（）.
Themarinecargoinsurancepremiumratesmayvarydependingonfactorssuchas（）.
Accordingtoacertaintypeofrate,ashippercannotbechargedlessthantheappropriaterateof4kginmostcases,eventhoughhisparticularconsignmentmayweighlessthanthis,wecallthistypeofrate（）.
Whichofthefollowingstatementsaretrueaboutdocumentarycredit_____?
Whichofthefollowingcoveragedoesnotcoverpartiallossordamageresultingfromnaturalcalamities?____
