The girl _____ the purple coat is his sister. [ ]
A. at
B. in
C. on
D. with
答案:B
不具吞噬功能,可通过ADCC效应杀伤肿瘤细胞的固有免疫细胞是()
A.巨噬细胞
B.γδT细胞
C.NK细胞
D.NKT细胞
E.中性粒细胞
斗轮机是只能从煤场取料给带式输送机的高效率运煤机器。()