骨髓来源细胞的分选速度宜选择高速是因为（）
A.细胞太多
B.细胞太大
C.细胞膜坚固
D.细胞核坚固
E.在总细胞群体中所占比例不高
参考答案：E
- Which of the two magazines will you take?
- I’ll take______ though I find ______ of them are very useful to me.
A．all; both
B．either; either
C．either; neither
D．either; both
对乙型肝炎患者采取血标本做乙肝五项检查需用
A．清洁干燥试管B．普通抗凝管C．肝素抗凝管D．0.1%草酸钠试管E．10%草酸钾试管
