职业肿瘤多见于
A．皮肤和肝脏B．肝和肺组织C．肝和膀胱D．皮肤和肺E．胃和膀胱
参考答案：D
不是光电效应的产物的是（）
A.光电子
B.正离子
C.特征辐射
D.俄歇电子
E.轫致辐射
Speaker A: Yes, can I help youSpeaker B: ______
A．Thanks. I'm very grateful for your help.
B．We're just looking. Thanks.
C．Yeah, can you help me with this experiment
D．Yes. Can you tell me how to get to the National Library
