美国财政部拍卖三个月期国债，得标利率4.200%（4月21日为4.225%），投标倍数3.10（前次为3.01）。拍卖六个月期国债，得标利率4.065%（4月21日为4.050%），投标倍数2.80（前次为2.93）。

Group 1 - The U.S. Treasury auctioned three-month Treasury bills with a winning yield of 4.200%, compared to 4.225% on April 21, indicating a slight decrease in yield [1] - The bid-to-cover ratio for the three-month bills was 3.10, an increase from the previous ratio of 3.01, suggesting stronger demand [1] - The auction of six-month Treasury bills had a winning yield of 4.065%, slightly up from 4.050% on April 21, reflecting stable interest rates [1] Group 2 - The bid-to-cover ratio for the six-month bills was 2.80, down from 2.93 in the previous auction, indicating a decrease in demand [1]