在细胞周期中的肿瘤细胞,哪一项细胞对放射线最不敏感()
A.G0/G1
B.S
C.G2/M
D.S期和G2/M期敏感性相同
E.以上各期细胞敏感性相同
参考答案:B
The artist made up his mind to devote all he could ______ his English before going abroad. [ ]
A. improve
B. to improve
C. to improving
D. improving
全口义齿排牙时上颌第一磨牙近中舌尖应()
A.接触平面
B.离开平面0.5mm
C.离开平面1.0mm
D.离开平面1.5mm
E.离开平面0.1mm