推力瓦是推力轴承中的转动部分
参考答案：错
速度是描述______的物理量，它指的是物体在______内通过的______．
Which of the following best explains the slope of the yield curve（）
A. The term spread between the yields of two maturities.
B. The credit spread between two securities with different maturities.
C. The nominal spread between two securities with different maturities.
