【单选题】下列关于巨幼细胞贫血叙述正确的是:
A.
外周血细胞形态只见成熟RBC高色素性大红细胞
【单选题】Which of the following is an intelligent repeater that is aware of the MAC addresses of the nodeson either side of the data link?()
【简答题】病毒的核衣壳的对称型有哪些?各有什么特点?
【单选题】The type of DNA amplification where the region of DNA amplified lies on either side of a known segment __________