An analyst does research about the Z-spread and nominal spread. Assume the Treasury spot-rate yield curve is upward slopping, compared to the nominal yield spread between a Treasury bond and an option-free corporate bond of similar maturity, Z-spread will be:

A. less than the nominal spread.
B. equal to the nominal spread.
C. greater than the nominal spread.

中风、痫证、厥证可共有的症状为（）

A.口吐涎沫

B.口眼斜

C.突然昏迷

D.四肢抽搐

E.角弓反张