HLA-Ⅰ类抗原分子()
A.递呈外源性抗原
B.可与CD8分子结合
C.由α链和β2m链组成
D.由HLAA、B、C基因编码
E.分布在所有有核细胞的表面
参考答案:C
在牙周膜中,哪一种细胞能增殖成颌骨囊肿或牙源性肿瘤
A.成纤维细胞
B.间质细胞
C.成骨细胞
D.Malasses上皮剩余
E.成牙骨质细胞
In a racetrack turn,to recover a man overboard,the vessel is steadied for the SECOND time after a turn of how many degrees from the original heading?()
A.60°
B.135°
C.180°
D.360°