Do you know the girl ____________ brown hair? [ ]
A. have
B. has
C. with
答案:C
治疗癫痫持续状态首选药为()
A.地西泮
B.氯丙嗪
C.哌替啶
D.苯巴比妥
E.对乙酰氨基酚
简述NK细胞的杀伤作用机制。