题目内容
PPD
A. purify protein derivative
B. purified protein derivative
C. purify protein derivation
D. purified protein derivation
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A. acquired immune deficiency symptom
B. acquired immuno deficiency syndrome
C. acquired immuno deficiency symptom
D. acquired immune deficiency syndrome
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A. human immunodeficiency virus
B. human immunodeficient virus
C. human immunodetection virus
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