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【单选题】
当管电压为 80 KV时, 电子入射到 X射线管的钨靶上产生的结果是A.
连续 X射线的最大能量是 80 keV
B.
特征 X射线的最大能量是80 keV
C.
产生的 X射线绝大部分是特征X射线
D.
仅有 1%的电子能量以热量的形式沉积在钨靶中
E.
以上都是
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皮皮学刷刷变学霸
举一反三
【单选题】He had a ____ look in his eyes. He must have been shocked. A) empty B) bare C) blank D) hollow
A.
empty
B.
bare
C.
blank
D.
hollow
【单选题】Why does the author say that the knowledge of the shapes and habits of wild animals was important to our ancestors?
A.
Because they loved animals so much.
B.
Because animals were the frequent subject of their paintings.
C.
Because they needed them to form. a religion.
D.
Because they wanted to live in safety, preventing themselves from being hurt by animals.
【简答题】Religion shapes the _____ its adherents have towards work, investment, consumption and individual responsibility.
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