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【单选题】
为了解新冠病毒肺炎患者预后差的影响因素,对191例患者进行了回顾性队列研究,结果如下表。为比较治疗后生存者和死亡者的淋巴细胞计数(Lymphocyte count, × per L)的差异,请问用何种假设检验方法?A.
生存者和死亡者的淋巴细胞计数变量如果满足正态分布或总体方差，则选用两独立样本的t检验
B.
生存者和死亡者的淋巴细胞计数变量如果满足正态分布且总体方差，则选用两独立样本的t检验
C.
两独立样本率比较的卡方检验
D.
R×C列联表的卡方检验
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【单选题】—How long does it take you to get to your company? — _ . [ ]
A.
Three weeks
B.
It takes 25 minutes
C.
I don't know
D.
Depend on you
【简答题】Model 1: People spend years really knowing who somebody is. Key: It takes people years to really know who somebody is. Model 2: I spent three days writing the novel. Key: It took me three days to writ...
【判断题】It takes three weeks to build one trailer before they start to use an assembly line.
A.
正确
B.
错误
【单选题】Mark Twain once said it takes more than three weeks to prepare an ( ) speech.
A.
spontaneous
B.
impromptu
C.
successful
D.
difficult
【简答题】A. Rewrite the following sentences after the models, using the models "It takes (somebody) time to do something." Model 1: People spend years really knowing who somebody is. It takes people years to r...
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