第26题: [单项选择]A.Cut down the time of exercise programs. B.See a doctor before involving in exercise. C.Change our lifestyle or habit beforehand. D.Stop exercising for at least a week. 参考答案:B 答案解析:[听力原文] What does the speaker suggest if we have health problems and want to improve through e
第27题: [单项选择]CT机的前准直器位于 A. 探测器前 B. 探测器后 C. X线管窗口 D. X线管右侧 E. X线管左侧 参考答案:C 答案解析:CT机的X线管窗口设有前准直器,用以屏蔽不必要的射线、产生扇形X线束。