Final answer:
The UCC's gap fillers provision applies to set a reasonable delivery time in a contract where delivery time is not specified or is inconsistent. It would likely uphold the seller's thirty-day timeframe for the delivery of flour, making the statement true.
Step-by-step explanation:
According to the Uniform Commercial Code (UCC), when a contract for the sale of goods does not specify a delivery time, gap fillers provisions can be used to determine a reasonable delivery time. In the scenario you've described, where one party’s standard-form agreement does not state a delivery time and the other’s states thirty days, the gap filler provision would come into play to resolve the inconsistency. In this case, the UCC would allow for a reasonable time for delivery which, if not otherwise agreed upon, is typically interpreted as the seller’s thirty-day timeframe. Therefore, the statement that the delivery time will be upheld according to the UCC's gap fillers is True.