确定溶血存在最可靠的指标是（）

A.红细胞寿命缩短

B.尿胆原排泄增多

C.幼红细胞增生

D.未结合胆红素增高

E.网织红细胞增多

When the wave period and the apparent rolling period are the same（）.

A.synchronous rolling occurs

B.roll period decreases

C.roll period increases

D.roll amplitude is dampened