问题
多项选择题
在MRI设备中，关于主磁体价值的描述，哪项正确（）
A.直接关系到磁场强度
B.直接关系到磁场均匀度
C.直接关系到磁场稳定性
D.不影响MRI图像质量
E.用以说明MRI设备类型
答案
参考答案：A, B, C, E
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在MRI设备中，关于主磁体价值的描述，哪项正确（）
A.直接关系到磁场强度
B.直接关系到磁场均匀度
C.直接关系到磁场稳定性
D.不影响MRI图像质量
E.用以说明MRI设备类型
参考答案：A, B, C, E
I moved to a new neighborhood two months ago. In the house with a large 31 across the road lived a taxi driver, a single parent with two school-aged children. At the end of the day, he would 32 his taxi on the road. I 33 why he did not park it in the garage. Then one day I learnt that he had another car in his garage. In the afternoon he would come home 34 work, leave his taxi and go out for his 35 affairs in his other car, not in his taxi. I felt it was a 36 . I was curious to see his personal car but did not make it until I 37 to be outside one evening two weeks 38 , when the garage door was 39 and he drove out in his “own” car: a Rolls-Royce（劳斯莱斯）! It shook me completely 40 I realized what that meant. You see, he was a taxi driver. But 41 inside, he saw himself as something else: a Rolls-Royce owner and a（n） 42 . He drove others in his taxi but himself and his children in his Rolls-Royce. The world looked at his taxi and 43 him a taxi driver. But for him, a taxi was just something he drove for a living. Rolls-Royce was something he drove fo  r a (n） 44 . We go to bed every night and 45 every morning as parents or children, not as bankers, CEOs or professors. We go for a 46 as close friends or go for a vacation as a 47 . We love life as it is. Yet often, we base our entire  happiness and success on how much bigger and better a 48 we have. And we ignore our Rolls-Royce, by 49 it dusty in our garage. We should focus more on 50 we are than what we do!
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