美国财政部拍卖六周期国债，得标利率4.245%（5月6日为4.235%），投标倍数2.77（前次报2.91）。

Core Insights - The U.S. Treasury Department auctioned six-month Treasury bills with a winning yield of 4.245%, an increase from the previous yield of 4.235% on May 6 [1] - The bid-to-cover ratio was 2.77, down from the previous ratio of 2.91, indicating a decrease in demand for the auctioned securities [1]