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【单选题】
与队列研究相比,病例对照研究的优点是A.
更容易避免系统误差
B.
更容易确定暴露与疾病的先后顺序
C.
更适合罕见病的研究
D.
更容易验证病因假设
E.
可以直接计算发病率
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【简答题】阅读理解 Have you ever suddenly felt that someone you knew was in trouble-and was he? Have you ever dreamed something that came true later? Maybe you have ESP(超感觉的知觉). ESP stands for Extrasensory Percepti...
【简答题】关于E150EV换挡杆描述正确的是()A. 起动车辆前请确认手柄处于N档位置 B. 在车辆运行过程中请勿换挡 C. 车辆使用完毕后(因此车型未设置P档位)应将手制动拉紧起到固定车辆的作用,以防车辆出现溜车现象。 D. 以上都不对
【单选题】----Have you ever seen Peter recently ? ---Yes . He _____ me to ask you how you _____ along with your new job these days .
A.
has asked ; have been getting
B.
asked ; were getting
C.
often asks ; are getting
D.
asked ; are getting
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