初产妇,28岁,孕36+周,有两次人工流产史。突然阴道流血约200ml。查体:BP105/60mmHg,腹软,无压痛。宫高31cm,胎先露浮动,胎心136次/分。为明确诊断首选的检查是()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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