美国财政部拍卖580亿美元三年期国债，得标利率3.784%（3月11日为3.908%），投标倍数2.47（前次为2.70）。

Core Points - The U.S. Treasury auctioned $58 billion in three-year notes with a winning yield of 3.784%, down from 3.908% on March 11 [1] - The bid-to-cover ratio was 2.47, slightly lower than the previous auction's ratio of 2.70 [1] Summary by Category Auction Details - The amount auctioned was $58 billion [1] - The winning yield decreased to 3.784% from 3.908% [1] - The bid-to-cover ratio was recorded at 2.47, compared to 2.70 in the last auction [1]