问题
单项选择题
放大摄影X线管焦点应等于或小于
A．0.01
B．0.05
C．0.1
D．0.3
E．0.5
答案
参考答案：D
解析： 由于X线管的焦点是面焦点，肢体离开胶片，半影对影像清晰度的影响会越来越明显。这会导致影像清晰度的下降。为此，X线放大摄影使用微焦点(0.1～0.3)X线管。使半影控制在0.2mm以内，则不会影响影像的清晰度。
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放大摄影X线管焦点应等于或小于
A．0.01
B．0.05
C．0.1
D．0.3
E．0.5
参考答案：D
解析： 由于X线管的焦点是面焦点，肢体离开胶片，半影对影像清晰度的影响会越来越明显。这会导致影像清晰度的下降。为此，X线放大摄影使用微焦点(0.1～0.3)X线管。使半影控制在0.2mm以内，则不会影响影像的清晰度。
Hi, my name is Eric.My ____ name is Li Mobai. I am an English boy. I _____ in China with my parents now. I’m tall and strong. I have short brown hair. Now, I ____ in No. 1 Middle School in Shanghai. I am in Class1, Grade7. I’m the class monitor. I can _____ Chinese very well. I _____ maths and music, too. I’m a member of the Music Club. I like ______ Chinese songs. Zhang Jie is my favourite star. I like sports very much. At weekends ,I often play _____ table tennis and basketball with my parents. _____ we go swimming. I have many good friends at school. I often _____ them study English after school. So they think I’m a(n) ______ boy. They all like me very much. Do you like me? Do you want to make friends with me?
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