美国财政部拍卖三个月期国债，得标利率4.195%（6月16日为4.240%），投标倍数3.49（前次为2.99）。拍卖六个月期国债，得标利率4.120%（6月16日为4.155%），投标倍数2.70（前次为2.73）。

Summary of Key Points Core Viewpoint - The U.S. Treasury conducted auctions for three-month and six-month Treasury bills, with notable changes in bid rates and bid-to-cover ratios, indicating investor demand and market conditions [1]. Group 1: Three-Month Treasury Bill Auction - The awarded yield for the three-month Treasury bill was 4.195%, a decrease from 4.240% on June 16 [1]. - The bid-to-cover ratio for the three-month bill was 3.49, an increase from the previous ratio of 2.99, suggesting stronger investor interest [1]. Group 2: Six-Month Treasury Bill Auction - The awarded yield for the six-month Treasury bill was 4.120%, down from 4.155% on June 16 [1]. - The bid-to-cover ratio for the six-month bill was 2.70, slightly lower than the previous ratio of 2.73, indicating stable but slightly reduced demand [1].