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【单选题】
对一项诊断试验作评价时,其阳性预测值和误诊率分别是:A.
a/(a+d)、b/(c+d)
B.
a/(a+c)、b/(b+d)
C.
a/(a+b)、b/(c+d)
D.
a/(a+b)、b/(b+d)
E.
a/(a+c)、d/(b+d)
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举一反三
【单选题】听力原文：W: Some of the younger students seemed quite aggressive in the meeting. M: Yes, they really took over when it came to the issues of voting fights. Q: What does the man say about the younger stude...
A.
They didn't have enough knowledge to discuss voting rights.
B.
They left the meeting when the subject of voting rights came up.
C.
They dominated the part of the meeting about voting rights.
D.
They were most agreeable on the subject of voting rights.
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