女性,43岁,因右上腹阵发性绞痛,伴恶心、呕吐4小时来院。查体:体温37℃,右上腹深在轻度压痛,无腹肌紧张,Murphy征阴性。为确诊进一步检查应首选()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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