Which of the following statements concerning taxable bonds is TRUE（）

A. Corporates have the lowest yields, followed by Treasuries, then by corporates, which provide the highest returns.

B. Treasuries have the lowest yields, followed by corporates, then by agencies, which provide the highest returns.

C. Treasuries have the lowest yields, followed by agencies, then by corporates, which provide the highest returns.

月经将至或正值经期的正常脉象是（）

A.脉细数弱

B.脉滑利

C.脉弦数

D.脉洪数

E.脉滑数