单选题：By saying “Bear in mind undetectable does not equal absent “

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题目类型：单选题
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题目内容：

By saying “Bear in mind undetectable does not equal absent “.Ho means A．AIDS virus may exist in the blood without being detected
B．AIDS virus is undetectable in the blood.
C．No AIDS virus can be detected in the blood.
D．No virus found in the blood means no AIDS.

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答案解析：

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