一般来说,使细胞丧失增值能力的平均致死剂量为()
A.<10Gy
B.<6Gy
C.<1Gy
D.<2Gy
E.<3Gy
参考答案:D
解析:放疗基本知识。
He _________ to the party this afternoon if he has something important to do.
A.needs not go
B.needn’t go
C.doesn’t need going
D.doesn’t need go
pH的内源调节