问题
单项选择题
某10居里的铱192源，距离其20米处，1小时的照射剂量为（）
A、275mR
B、27.5mR
C、13.75mR
D、2.5mR
答案
参考答案：C
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某10居里的铱192源，距离其20米处，1小时的照射剂量为（）
A、275mR
B、27.5mR
C、13.75mR
D、2.5mR
参考答案：C
Do you want to be a good child? I have a friend whose parents live in another city. One day I went to see her. We had a nice conversation. Then she wanted to 21 . So she dialed the number , but then she put down the phone. After about fifteen seconds, she dialed the number again “I, Mom.” Later I asked , “22 did you dial the number twice?”She smiled, “My parents are old and 23 . They can’t get close to the telephone quickly. I always do so when I call them. I just want to give them enough time to answer the call.” My friend is a good girl. She is 24 thinking about her parents. You also want to be a good child, right? Please remember to 25 your parents in every situation, not just on some important days.
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