某公司对外发盘时规定了发盘的有效期，根据《联合国国际货物销售合同公约》的规定，这项发盘在有效期内（）
Theobjectiveininventorystrategyistoachievedesiredcustomerservicewiththeminimuminventorycommitment.
Paymentofthepurchaseistobeeffectedbyanirrevocableletterofcreditinourfavour,payablebydraftatsightinpoundssterlinginLondon.