问题
单项选择题 A1/A2型题
X线成像的基础是（）
A.荧光效应
B.感光效应
C.穿透性
D.电离效应
E.生物效应
答案
参考答案：C
解析：穿透性是X线成像的基础，荧光效应是透视检查的基础，感光效应是X线摄影的基础。除此之外，X线的电离效应为放射剂量学的基础，生物效应是放射治疗学的基础，也是进行X线检查时需要注意防护的原因。
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X线成像的基础是（）
A.荧光效应
B.感光效应
C.穿透性
D.电离效应
E.生物效应
参考答案：C
解析：穿透性是X线成像的基础，荧光效应是透视检查的基础，感光效应是X线摄影的基础。除此之外，X线的电离效应为放射剂量学的基础，生物效应是放射治疗学的基础，也是进行X线检查时需要注意防护的原因。
My father and I were very close. I loved pleasing him, and he was always 21 of my success. If I 22 a spelling contest at school, he was on top of the 23 . Later in life whenever I got a promotion, I’d call my father 24 and he’d rush out to tell all his 25 . In 1970, when I was 26 as president of the Ford Motor Company, I don’t know 27 of us was more excited. Like many native Italians, my parents were very open with their 28 and their love not only at home, but also in public. Most of my friends would 2 9 hug their fathers. But I hugged and kissed my dad at every 30 —nothing could have felt more 31 . He was a(n) 32 man who was always trying new things. He was the first person in Allentown to buy a motorcycle. 33 , my father and his motorcycle didn’t 34 too well. He fell off it so often that he 35 it just a month after buying it. As a result, he never again 36 any vehicle with less than four wheels. Because of that motorcycle, I wasn’t 37 to have a bicycle when I was growing up. Whenever I wanted to ride a bike, I had to 38 one from a friend. However, my father let me drive a car as soon as I 39 sixteen. My father and I loved and 40 each other. We were close to each other all the time.
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