成熟T、B细胞主要定居场所是( )。
A.骨髓
B.胸腺
C.腔上囊
D.黏膜相关淋巴组织
E.脾脏和淋巴结
参考答案:E
We have been good friends for years.And we must ___ the friendship between us.
A.go on with
B.keep on
C.keep up
D.remain
若脊麻没有引起并发症,一周脑脊液应该是()
A.正常
B.白细胞计数增加
C.蛋白含量增加
D.压力仍高于正常
E.比重稍大于1.009