对于M细胞描述错误的是()
A.呈穹隆状
B.可摄取肠腔内抗原性异物
C.可转运抗原
D.是专职APC细胞
E.包绕着T细胞、B细胞、M中和DC
参考答案:D
连抛一枚均匀硬币4次,既有正面又有反面的概率为______。
A.7/8
B.1/8
C.5/8
D.1/16
She had _______ got out of the house _______ it began to rain.
A.no sooner… then
B.no sooner… than
C.hardly…than
D.hardly… then