题目内容

某妇，27岁，停经3个月，不规则阴道流血10天，近日有恶心，频吐，宫底未闻及胎心，下例哪项检查最有助于确诊

A. ct
B. 多普勒听胎心
C. 血hCG测定
D. 妇科检查
E. X线腹部平片
F. B超检查

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