美国财政部拍卖三个月期国债，得标利率4.3%（5月5日为4.220%），投标倍数2.51（前次为2.74）。拍卖六个月期国债，得标利率4.105%（5月5日为4.090%），投标倍数3.26（前次为3.52）。

Core Points - The U.S. Treasury auctioned three-month Treasury bills with a winning yield of 4.3%, up from 4.220% on May 5 [1] - The bid-to-cover ratio for the three-month bills was 2.51, lower than the previous auction's ratio of 2.74 [1] - The six-month Treasury bills were auctioned with a winning yield of 4.105%, slightly higher than the 4.090% on May 5 [1] - The bid-to-cover ratio for the six-month bills was 3.26, down from the previous ratio of 3.52 [1]