问题
单项选择题
60钴放射源的平均寿命为（）。
A.5.27年
B.7.59年
C.10.93年
D.10.54年
E.21.08年
答案
参考答案：B
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60钴放射源的平均寿命为（）。
A.5.27年
B.7.59年
C.10.93年
D.10.54年
E.21.08年
参考答案：B
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| He was put in a small ward(病房) with another patient in a hospital. The ward had nothing 1 a small window that 2 to the outside world. His roommate was allowed to 3 in bed because some medical instruments would take some liquid out of his lung every afternoon, 4 he could only lie in bed all day long His roommate's bed was close to the 5 . Every afternoon, when sitting up by the window, his roommate would happily 6 him the ongoing scenes outside the window. His roommate's vivid descriptions made him feel like seeing the 7 scene with his own eyes. Never ever had he been so 8 for a look at the world outside the window as he was now. On a slightly rainy evening, he didn't feel satisfied with his 9 suddenly: Why could his roommate 10 the beautiful landscapes outside the window while he couldn't? At midnight, he stared at the ceiling and 11 into thought. All of a sudden, his roommate began coughing 12 and wanted to call the nurse, but failed to 13 the button of the bell. He 14 to be sound asleep, but after second thoughts he wanted to 15 the bell button. In his 16 of seconds, he shockingly found that his roommate had stopped 17 . On his roommate's death, he felt lonely, greatly miserable and guilty for not 18 his roommate. The doctor thought that he did not want to face a(n) 19 bed every day, so he promised to 20 another ward for him. Just the moment he was lifted onto the stretcher(担架), he spotted the scene outside the window-a pale wall. | ||||
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