放射性物质对生物尤其对人体的效应，主要取决于接受辐射照射量的轻重程度。
参考答案：对
A person e-mail account is full won't be able to send or receive any e-mails. [ ]
A. who
B. whom
C. whose
D. whoever
零件的机械加工结构工艺性
