分批交货的大宗交易中为了节省开证费用常使用（ ）。

A. 对开信用证
B. 循环信用证
C. 背对背信用证
D. 预支信用证

信用证的有效期为1个月、6个月或类似规定，但未注明从何时起算，按照((UCP 500)规定，其起算日应从()。

A. 申请开证日期起算
B. 开立信用证日期起算
C. 通知信用证日期起算

合同或信用证没有规定投保加成率，根据《UCP500》的规定，卖方可在CIF总值的基础上()投保。

A. 加二成
B. 加一成
C. 加三成
D. 加四成

根据合同审核信用证，并修改不符点SalesContractNo.:ss03Date:May20.2006Seller:ShanghaistationeryandsportinggoodsImp.andExp.Corp.Address:5-15mansion1230-1240Zhongshanroad,shanghaiBuyer:SmithCo.Ltd.,Address:TheJanestreet,Kongzone,London,EnglandThiscontractismadebyandbetweenthebuyersandthesellers,wherebythebuyersagreetobuyandthesellersagreetoselltheundermentionedcommodityaccordingtothetermsandconditionsstipulatedbelow:Nameofcommodity:men’sglovesSpecification:ModelNo.5Quantity:2000dozensUnitPrice:CFRAmsterdamUSD45.00perdozenAmount:USD90000.00(SayU.S.DollarsNinetyThousandOnly)Shipment:FromShanghai,ChinatoAmsterdam,Holland.NotLaterThanJuly30,2006withtransshipmentandpartialshipmentnotallowedPacking:BySeaworthycartons(CTNS)Insurance:TobecoveredbybuyersTermsofPayment:ByirrevocableletterofCreditatSightShippingMarks:Atsellers’optionL/CCREDITNUMBER:A2B9600463DATEOFISSUE:060618ADVISINGBANK：BANKOFCHINAZHONGSHANDONGYILU23SHANGHAICHINAFORMOFDOCUMENTARYCREDIT:IRREVOCABLEDATEANDPLACEEXPIRY:060830/ONISSUINGBANK’SCOUNTERSAPPLICANT：SMITHCO.LTD.,THEJANESTREET,KONGZONE,LONDON,ENGLANDBENEFICIARY：SHANGHAISTATIONERYANDSPORTINGGOODSIMP.AND EXP.CORP.5-15MANSION1230-1240ZHONGSHANROAD,SHANGHAICURRENCYCODE,AMOUNT:USD90000.00AVAILABLEWITH...BY..:ANYBANKINADVISINGBANK'SCOUNTRYBYNEGOTIATIONAT30DAYS SIGHTDRAFT(S)DRAWNON：ABNAMROBANKNV,LONDONPARTIALSHIPMENTS:PERMITTEDTRANSSHIPMENT:PROHIBITEDLOADINGONBOARD/DISPATCH/TAKINGINCHARGEAT/FROM:SHANGHAIPORTFORTRANSPORTATIONTO:AMSTERDAMPORTSHIPMENTPERIOD:NOTLATERTHAN060630DESCRIPTIONOFGOODS:2000DOZENSMEN'SGLOVESCFRAMSTERDAMATUSD45.00 EACH经审核，该信用证的不符点修改如下：