问题
单项选择题
下列感光的影响因素中，属于经常变动的是( )。
A．球管电流
B．球管电压
C．球管曝光时间
D．焦-片距离
E．以上都是
答案
参考答案：E
解析： 管电压(最重要的因素)、管电流、曝光时间、焦-片距是需要根据病变情况经常变动的因素，常称为“X线摄影条件”。
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下列感光的影响因素中，属于经常变动的是( )。
A．球管电流
B．球管电压
C．球管曝光时间
D．焦-片距离
E．以上都是
参考答案：E
解析： 管电压(最重要的因素)、管电流、曝光时间、焦-片距是需要根据病变情况经常变动的因素，常称为“X线摄影条件”。
| 补全对话(从七个选项中选出五个，完成以下对话）。 | |
B: Yes, I have been there many times. A: 2 . B: Yes, I like the city very much. She's coming one of the most modern cities in the world. A: 3 . B: The city is clean and beautiful. The people are kind and the football team is strong. A: 4 . B: No, not very hot. You may have a swim in the sea. A: How cool! Swimming in the sea must be more wonderful than in the lake. B: I'm sure you'll have a good time there. A: Would you please go with me? B: 5 . A: What a pity! |