患者女性,28岁。已婚,未生育。现停经50天,有少量阴道流血,无早孕反应。妇科检查:宫口闭,软,双附件(-)。该病例最简单的辅助检查方法是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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