17.the credit is available for negotiation or payment abroad until… 本证在国外议付或付款的日期到……为止
18.documents to be presented to negotiation bank within 15 days after shipment 单据需在装船后15天内交给议付行
19.documents must be presented for negotiation within…days after the on board date of bill of lading/after the date of issuance of forwarding agents' cargo receipts 单据需在已装船提单/运输行签发之货物承运收据日期后……天内提示议付