问题
单项选择题
对X线治疗机的错误要求是()
A．X线球管的真空度要求为106～107
B．每天开机前，要对深部X线机的球管进行“真空训练”
C．浅层X线机的球管要使用风冷或水冷
D．深部X线治疗机的球管，要先用水冷，再用油冷却水
E．X线球管阳极，要加几百kv的高压作为电子加速电场
答案
参考答案：D
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对X线治疗机的错误要求是()
A．X线球管的真空度要求为106～107
B．每天开机前，要对深部X线机的球管进行“真空训练”
C．浅层X线机的球管要使用风冷或水冷
D．深部X线治疗机的球管，要先用水冷，再用油冷却水
E．X线球管阳极，要加几百kv的高压作为电子加速电场
参考答案：D
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| Zhang Xiangxiang was born on July 16, 1983 in Longyan, Fujian Province. He l _ the gold medalin the men's 62kg weightlift ing in the Beijing 2008 0lympic Cames. In 1991 , Zhang was a student in Grade 3 in primary school. The2 , Zhu Riping found that he was good and advised him to practice weightlifting. 3 _ . Zhang's father didn't agree at first. He thought it was cruel for a little child t0 4 weights all day. Thanks to his coach's insistence, his father agreed in the end. Before winning his first Olympic gold medal, 5 people knew who Zhang Xiangxiang was. In order to win his gold medal, he 6 his best to overcome many difficulties.Unfortunately, his back was badly 7 in training. Because of his doctor's carelessness, he almost 8 his life.Doccors warned Zhang that he would 9 . be fit enough to compete in weightlifting again, but he held on. 10 Zhang's own words: So long as you live, you can achieve everything. |
