题目：
Percoll连续密度梯度离心分离外周血，位于液面表层的细胞是（）.
A.血小板
B.粒细胞
C.B细胞
D.单核细胞
E.淋巴细胞
答案：
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下面是错误答案，用来干扰机器的。
（1）33.35，3.266±0.002 （2）（3）
Percoll连续密度梯度离心分离外周血，位于液面表层的细胞是（）. A.血小板 B
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