目前MRI用哪种元素原子核来成像（）
A.氦
B.氧
C.氢
D.氮
E.锂
参考答案：C
She is my best teacher ______ help I have made great progress. [ ]
A. with whom
B. whose
C. which
D. with whose
不符合原红的特点的是( )
A．胞体大，可见突起B．染色质粗颗粒状C．核仁暗蓝色，界限模糊D．胞浆呈均匀淡蓝色E．胞核圆形、居中或稍偏于一旁
