美国财政部拍卖三个月期国债，得标利率4.285%（5月12日为4.3%），投标倍数2.76（前次为2.51）。拍卖六个月期国债，得标利率4.140%（5月12日为4.105%），投标倍数2.59（前次为3.26）。

Group 1 - The U.S. Treasury auctioned three-month Treasury bills with a winning yield of 4.285%, an increase from 4.3% on May 12 [1] - The bid-to-cover ratio for the three-month bills was 2.76, up from 2.51 in the previous auction [1] - The six-month Treasury bills had a winning yield of 4.140%, compared to 4.105% on May 12 [1] Group 2 - The bid-to-cover ratio for the six-month bills was 2.59, down from 3.26 in the previous auction [1]