题目内容

It can be inferred from Willinger's point of view that the system _____ .

A. is a total failure
B. is elaborately designed
C. could make the sleep environment unsafe
D. is not applicable to the safe sleep environment

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Complete the following sentences with the right medical terms given below . The chain of events between _____ of a drug and production of these effects in the body can be divided into two important components, both of which contribute to variability in drug actions.

A. administration
B. preparation
C. proscription
D. injection

为了研究膀胱癌病人化疗后的生存情况，进行纵向随访收集资料时，以下哪一生存结局不能当删失数据处理 ( ) ？

A. 死于膀胱癌或其并发症
B. 死于意外事故
C. 死于其它肿瘤
D. 因病人不配合主动退出

一般而言，验证样本占总样本量的比例为（）？

A. 1
B. 15
C. 2
D. 25
E. 5

直线回归中，如果自变量X乘以一个不为0或1的常数，则有（）。

A. 截距改变
B. 回归系数改变
C. 两者都改变
D. 两者都不改变