放射工作人员全身均匀照射时，防止随机性效应的年剂量当量限值是（） A.10mSv B
题型：单项选择题
问题：
放射工作人员全身均匀照射时，防止随机性效应的年剂量当量限值是（）
A.10mSv
B.20mSv
C.30mSv
D.40mSy
E.50mSv
题型：单项选择题
| 为下列句子选择正确的图片。 | |
| ( ) 1. She did the housework yesterday. | A. |
| ( ) 2. He phoned his friend yesterday. | B. |
| ( ) 3. They walked in the park on Sunday. | C. |
| ( ) 4. She cooked fish yesterday. | D. |
| ( ) 5. She played on the computer yesterday. | E. |
