单项选择题 When the dispute over duty payment arises between the duty payer and the Customs, the duty payer should first pay the duty and then, within （） of the issuance of the duty memo, apply to the Customs in writing for a reconsideration of the case.

单项选择题 Payment by L/C will also be incorporated （） the sales contract.

单项选择题 As there is no direct sailing （） your port this month, please amend your L/C to allow partial shipments.