以下疾病是珠蛋白肽链结构异常所致的是（）
A.海洋性贫血
B.镰状细胞贫血
C.遗传性棘形细胞增多症
D.PNH
E.TTP
参考答案：B
Barnes Company issues a bond at a premium to fund a capital project. With respect to the effective interest method, in each subsequent year, the reported annual interest expense for this bond will most likely:（）
A. decrease.
B. remain the same.
C. increase.
简述富氧鼓风后的冶炼特征。
