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【单选题】
妊娠3个月后，诊断死胎的化验指标主要是(    )
A.
孕妇尿中雌酮突然减少    
B.
孕妇尿中孕酮突然减少
C.
孕妇尿中β-雌二醇突然减少    
D.
孕妇尿中雌三醇突然减少
E.
孕妇尿中HCG突然减少
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