国内常用的血细胞分析仪，使用的检测系统大致可分为哪两类（）。

A.光衍射检测系统

B.光散射检测系统

C.电阻抗检测系统

D.血细胞化学检测系统

E.流式细胞检测系统

—It's May 3rd. But I don't know the day. Can you tell me?

—_____.[ ]

A. It's very cold

B. It isn't May 2nd

C. It's Friday

D. It's his birthday