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【单选题】
实验流行病学研究是流行病学常用的一种研究方法，现拟进行一项实验研究，在饮水中加入氟，以观察氟防龋的效果 实验首先要确定样本量，说法不正确的是
A.
要以龋齿在一般人群中的发生率高低为依据
B.
样本量大小与检验的显著性水平有关
C.
单尾检验和双尾检验对样本量的大小要求无差别
D.
样本量过小，检验效能偏低，所得结论不可靠
E.
可以参照样本量计算公式进行计算
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28. --- It took me ten years to build up my business,and it almost killed me. --- Well, you know what they say. _________. （江苏） A. There is no smoke without fire 
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打算要住几天？
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【单选题】Speaker A: It took me ten years to build up my business, and it almost killed me. Speaker B: Well, you know what they say:______
A.
There is no smoke without fire.
B.
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All roads lead to Rome.
D.
No pains, no gains.
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正确
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错误
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【判断题】25号端口一般是用于接收邮件的。
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正确
B.
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【单选题】Speaker A: It took me ten years to build up my business, and it almost killed me. Speaker B: Well, you know what they say:______
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