某患者腹部局限性膨隆,可因腹内原因(如脏器肿大、腹内肿瘤、炎性包块、胃或肠曲胀气)和腹壁上肿物等原因,为了进行鉴别,医生常采用下列哪一种方法( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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