美国财政部拍卖三个月期国债，得标利率4.220%（4月28日为4.200%），投标倍数2.74（前次为3.10）。拍卖六个月期国债，得标利率4.090%（4月28日为4.065%），投标倍数3.52（前次为2.80）。

Group 1 - The U.S. Treasury auctioned three-month Treasury bills with a winning yield of 4.220%, an increase from 4.200% on April 28 [1] - The bid-to-cover ratio for the three-month Treasury bills was 2.74, down from 3.10 in the previous auction [1] - The auction of six-month Treasury bills had a winning yield of 4.090%, up from 4.065% on April 28 [1] Group 2 - The bid-to-cover ratio for the six-month Treasury bills was 3.52, an increase from 2.80 in the previous auction [1]